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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras A mate-in-12 problem White to move on an infinite, edgeless board. 0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0 Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z 0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0 Z0Z0ZkZ0Z0Z0Z0Z0Z0ZKZ0Z 0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0 ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z 0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0 Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z Can white force mate in 12 moves? Theory of infinite games Joel David Hamkins, New York
Transcript
Page 1: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

A mate-in-12 problem

White to move on an infinite, edgeless board.

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0Z0Z0ZKZ0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Can white force mate in 12 moves?

Theory of infinite games Joel David Hamkins, New York

Page 2: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

An introduction to the theory of infinitegames, with examples from infinite chess

Joel David Hamkins

The City University of New YorkCollege of Staten Island

The CUNY Graduate Center(& MathOverflow ;-)

Mathematics, Philosophy, Computer Science

Group in Philosophical and Mathematical LogicUniversity of Connecticut, Storrs

December 2014

Theory of infinite games Joel David Hamkins, New York

Page 3: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

This talk includes joint work with:

C. D. A. Evans (U.S. national master)

Dan Brumleve

Philip Schlicht

Links to articles available at http://jdh.hamkins.org.

Theory of infinite games Joel David Hamkins, New York

Page 4: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

What is an infinite game?

Consider two-player infinite games of perfect information.

The two players take turns making moves:

White: a0 a2 a4 a6 · · ·

Black: a1 a3 a5 · · ·

Together they build a particular play ~a = 〈a0,a1,a2, . . .〉 of thegame.

White wins this instance of the game if the play ~a ∈ A, a fixedset specifying the winning conditions. Otherwise, Black wins.

Theory of infinite games Joel David Hamkins, New York

Page 5: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

What is an infinite game?

Consider two-player infinite games of perfect information.

The two players take turns making moves:

White: a0 a2 a4 a6 · · ·

Black: a1 a3 a5 · · ·

Together they build a particular play ~a = 〈a0,a1,a2, . . .〉 of thegame.

White wins this instance of the game if the play ~a ∈ A, a fixedset specifying the winning conditions. Otherwise, Black wins.

Theory of infinite games Joel David Hamkins, New York

Page 6: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

What is an infinite game?

Consider two-player infinite games of perfect information.

The two players take turns making moves:

White: a0 a2 a4 a6 · · ·

Black: a1 a3 a5 · · ·

Together they build a particular play ~a = 〈a0,a1,a2, . . .〉 of thegame.

White wins this instance of the game if the play ~a ∈ A, a fixedset specifying the winning conditions. Otherwise, Black wins.

Theory of infinite games Joel David Hamkins, New York

Page 7: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

What is an infinite game?

Consider two-player infinite games of perfect information.

The two players take turns making moves:

White: a0 a2 a4 a6 · · ·

Black: a1 a3 a5 · · ·

Together they build a particular play ~a = 〈a0,a1,a2, . . .〉 of thegame.

White wins this instance of the game if the play ~a ∈ A, a fixedset specifying the winning conditions. Otherwise, Black wins.

Theory of infinite games Joel David Hamkins, New York

Page 8: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

What is an infinite game?

Consider two-player infinite games of perfect information.

The two players take turns making moves:

White: a0 a2 a4 a6 · · ·

Black: a1 a3 a5 · · ·

Together they build a particular play ~a = 〈a0,a1,a2, . . .〉 of thegame.

White wins this instance of the game if the play ~a ∈ A, a fixedset specifying the winning conditions. Otherwise, Black wins.

Theory of infinite games Joel David Hamkins, New York

Page 9: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

What is an infinite game?

Consider two-player infinite games of perfect information.

The two players take turns making moves:

White: a0 a2 a4 a6 · · ·

Black: a1 a3 a5 · · ·

Together they build a particular play ~a = 〈a0,a1,a2, . . .〉 of thegame.

White wins this instance of the game if the play ~a ∈ A, a fixedset specifying the winning conditions. Otherwise, Black wins.

Theory of infinite games Joel David Hamkins, New York

Page 10: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

What is an infinite game?

Consider two-player infinite games of perfect information.

The two players take turns making moves:

White: a0 a2 a4 a6 · · ·

Black: a1 a3 a5 · · ·

Together they build a particular play ~a = 〈a0,a1,a2, . . .〉 of thegame.

White wins this instance of the game if the play ~a ∈ A, a fixedset specifying the winning conditions. Otherwise, Black wins.

Theory of infinite games Joel David Hamkins, New York

Page 11: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

What is an infinite game?

Consider two-player infinite games of perfect information.

The two players take turns making moves:

White: a0 a2 a4 a6 · · ·

Black: a1 a3 a5 · · ·

Together they build a particular play ~a = 〈a0,a1,a2, . . .〉 of thegame.

White wins this instance of the game if the play ~a ∈ A, a fixedset specifying the winning conditions. Otherwise, Black wins.

Theory of infinite games Joel David Hamkins, New York

Page 12: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Winning strategies

A strategy for a player is a function that tells the player whatmove to make next, given the finite sequence of precedingmoves.

σ : 〈a0,a1, . . . ,ak−1〉 7→ ak

A winning strategy for a player is a strategy that, when followed,results in a winning play, no matter how the opponent plays.

Obviously, at most one of the players can have a winningstrategy.

Theory of infinite games Joel David Hamkins, New York

Page 13: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Example infinite games

Consider the following winning conditions for White, where theplayers play 0 or 1 at each step.

A = the set of eventually periodic sequences.B = set of universal sequences (all finite strings occur)C = set of strings containing 00 or 111 but not 0001.D = a countable set.

If white has a winning strategy for X , does black have a winningstrategy for the complement?

Theory of infinite games Joel David Hamkins, New York

Page 14: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Example infinite games

Consider the following winning conditions for White, where theplayers play 0 or 1 at each step.

A = the set of eventually periodic sequences.B = set of universal sequences (all finite strings occur)C = set of strings containing 00 or 111 but not 0001.D = a countable set.

If white has a winning strategy for X , does black have a winningstrategy for the complement?

Theory of infinite games Joel David Hamkins, New York

Page 15: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Example infinite games

Consider the following winning conditions for White, where theplayers play 0 or 1 at each step.

A = the set of eventually periodic sequences.B = set of universal sequences (all finite strings occur)C = set of strings containing 00 or 111 but not 0001.D = a countable set.

If white has a winning strategy for X , does black have a winningstrategy for the complement?

Theory of infinite games Joel David Hamkins, New York

Page 16: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Example infinite games

Consider the following winning conditions for White, where theplayers play 0 or 1 at each step.

A = the set of eventually periodic sequences.B = set of universal sequences (all finite strings occur)C = set of strings containing 00 or 111 but not 0001.D = a countable set.

If white has a winning strategy for X , does black have a winningstrategy for the complement?

Theory of infinite games Joel David Hamkins, New York

Page 17: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Example infinite games

Consider the following winning conditions for White, where theplayers play 0 or 1 at each step.

A = the set of eventually periodic sequences.B = set of universal sequences (all finite strings occur)C = set of strings containing 00 or 111 but not 0001.D = a countable set.

If white has a winning strategy for X , does black have a winningstrategy for the complement?

Theory of infinite games Joel David Hamkins, New York

Page 18: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Fundamental question

Question

In any game, must one of the players have a winning strategy?

Definition

A game is determined if one player has a winning strategy.

Question

Is every game determined?

Theory of infinite games Joel David Hamkins, New York

Page 19: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

DeterminacyAxiom of Determinacy (AD)

The axiom of determinacy is the assertion that every game hasa strategy for one of the players.

Do we have any reason to believe this axiom?

In what sense is this an “axiom”?

Axioms are self-evident principles(Euclidean axioms, Peano axioms, set theory axioms)

Axioms define a collection of structures, a domain of discourse(group axioms)

Axioms express a succinct prescient vision of possibility(CH, MA, V = L, ♦)

Theory of infinite games Joel David Hamkins, New York

Page 20: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

DeterminacyAxiom of Determinacy (AD)

The axiom of determinacy is the assertion that every game hasa strategy for one of the players.

Do we have any reason to believe this axiom?

In what sense is this an “axiom”?

Axioms are self-evident principles(Euclidean axioms, Peano axioms, set theory axioms)

Axioms define a collection of structures, a domain of discourse(group axioms)

Axioms express a succinct prescient vision of possibility(CH, MA, V = L, ♦)

Theory of infinite games Joel David Hamkins, New York

Page 21: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Evidence for AD

White has a winning strategy: ∃a0 ∀a1 ∃a2 · · · A(~a)

Black has a winning strategy: ∀a0 ∃a1 ∀a2 · · · ¬A(~a)

AD asserts: White has no ws ⇐⇒ Black has a ws.

In other words, AD is the assertion:

¬(∃a0 ∀a1 ∃a2 · · · A(~a)

)⇐⇒

(∀a0 ∃a1 ∀a2 · · · ¬A(~a)

).

Thus, AD is an infinitary de Morgan law.

¬∃x A(x) ⇐⇒ ∀x ¬A(x)

¬∃x ∀y A(x , y) ⇐⇒ ∀x ∃y ¬A(x , y)

Conclusion: all finite-length games are determined.

Theory of infinite games Joel David Hamkins, New York

Page 22: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Evidence for AD

White has a winning strategy: ∃a0 ∀a1 ∃a2 · · · A(~a)

Black has a winning strategy: ∀a0 ∃a1 ∀a2 · · · ¬A(~a)

AD asserts: White has no ws ⇐⇒ Black has a ws.

In other words, AD is the assertion:

¬(∃a0 ∀a1 ∃a2 · · · A(~a)

)⇐⇒

(∀a0 ∃a1 ∀a2 · · · ¬A(~a)

).

Thus, AD is an infinitary de Morgan law.

¬∃x A(x) ⇐⇒ ∀x ¬A(x)

¬∃x ∀y A(x , y) ⇐⇒ ∀x ∃y ¬A(x , y)

Conclusion: all finite-length games are determined.

Theory of infinite games Joel David Hamkins, New York

Page 23: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Evidence for AD

White has a winning strategy: ∃a0 ∀a1 ∃a2 · · · A(~a)

Black has a winning strategy: ∀a0 ∃a1 ∀a2 · · · ¬A(~a)

AD asserts: White has no ws ⇐⇒ Black has a ws.

In other words, AD is the assertion:

¬(∃a0 ∀a1 ∃a2 · · · A(~a)

)⇐⇒

(∀a0 ∃a1 ∀a2 · · · ¬A(~a)

).

Thus, AD is an infinitary de Morgan law.

¬∃x A(x) ⇐⇒ ∀x ¬A(x)

¬∃x ∀y A(x , y) ⇐⇒ ∀x ∃y ¬A(x , y)

Conclusion: all finite-length games are determined.

Theory of infinite games Joel David Hamkins, New York

Page 24: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Evidence for AD

White has a winning strategy: ∃a0 ∀a1 ∃a2 · · · A(~a)

Black has a winning strategy: ∀a0 ∃a1 ∀a2 · · · ¬A(~a)

AD asserts: White has no ws ⇐⇒ Black has a ws.

In other words, AD is the assertion:

¬(∃a0 ∀a1 ∃a2 · · · A(~a)

)⇐⇒

(∀a0 ∃a1 ∀a2 · · · ¬A(~a)

).

Thus, AD is an infinitary de Morgan law.

¬∃x A(x) ⇐⇒ ∀x ¬A(x)

¬∃x ∀y A(x , y) ⇐⇒ ∀x ∃y ¬A(x , y)

Conclusion: all finite-length games are determined.

Theory of infinite games Joel David Hamkins, New York

Page 25: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Further evidence: AD has nice consequences

The axiom of determinacy (without using AC) has amazinglyattractive consequences:

Every set of reals is Lebesgue measurable.Every set of reals differs from an open set by a meager set.Every uncountable set of reals contains a perfect set.

On consequentialist grounds, this is strong evidence for AD.

AD leverages innate human capacity for strategic reasoning.

AD is deeply connected with large cardinals, equiconsistentwith infinitely many Woodin cardinals.

Theory of infinite games Joel David Hamkins, New York

Page 26: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Evidence against ADNevertheless,

Theorem

AD contradicts the axiom of choice.

Proof idea

To prove this, construct the counterexample set in a transfiniterecursion of length continuum. Well-order the binary-playstrategies in order type continuum, and at stage α, we’ve madefewer than continuum many promises, and so we can add aplay to the set and to the complement so as to prevent a givenstrategy from winning for either side.

Set theorists often study fragments of AD in ZFC.

Theory of infinite games Joel David Hamkins, New York

Page 27: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open gamesOpen games generalize the concept of finite games.

A game is open for a player, if every winning instance of thegame for that player is won already at a finite stage. That is, if ~ais a winning play, then there is some finite play s = ~a � n suchthat all extensions of s are winning, no matter how playcontinues from s.

This is equivalent to saying that A is an open set in the producttopology on the space of all plays.

Similarly, a game is closed for a player, if it is open for theopposing player.

To win an open game, you must win at some finite stage. Towin a closed game, it suffices never to lose at any finite stage.

Theory of infinite games Joel David Hamkins, New York

Page 28: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open Determinacy

Theorem (Gale,Stewart 1953)

Every open game is determined. One of the players has awinning strategy.

We give a proof using the concept of ordinal game values.

Recall the ordinals...

0 1 2 · · · ω ω+1 · · · ω·2 ω·2+1 · · · ω·n+k · · · ω2

ω2+1 · · · ωn · · · ωω · · · ε0 · · · ωCh1

?= ωCK

1 · · · ω1 · · ·

Theory of infinite games Joel David Hamkins, New York

Page 29: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open Determinacy

Theorem (Gale,Stewart 1953)

Every open game is determined. One of the players has awinning strategy.

We give a proof using the concept of ordinal game values.

Recall the ordinals...

0 1 2 · · · ω ω+1 · · · ω·2 ω·2+1 · · · ω·n+k · · · ω2

ω2+1 · · · ωn · · · ωω · · · ε0 · · · ωCh1

?= ωCK

1 · · · ω1 · · ·

Theory of infinite games Joel David Hamkins, New York

Page 30: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open Determinacy

Theorem (Gale,Stewart 1953)

Every open game is determined. One of the players has awinning strategy.

We give a proof using the concept of ordinal game values.

Recall the ordinals...

0 1 2 · · · ω ω+1 · · · ω·2 ω·2+1 · · · ω·n+k · · · ω2

ω2+1 · · · ωn · · · ωω · · · ε0 · · · ωCh1

?= ωCK

1 · · · ω1 · · ·

Theory of infinite games Joel David Hamkins, New York

Page 31: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open Determinacy

Theorem (Gale,Stewart 1953)

Every open game is determined. One of the players has awinning strategy.

We give a proof using the concept of ordinal game values.

Recall the ordinals...

0 1 2 · · · ω ω+1 · · · ω·2 ω·2+1 · · · ω·n+k · · · ω2

ω2+1 · · · ωn · · · ωω · · · ε0 · · · ωCh1

?= ωCK

1 · · · ω1 · · ·

Theory of infinite games Joel David Hamkins, New York

Page 32: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open Determinacy

Theorem (Gale,Stewart 1953)

Every open game is determined. One of the players has awinning strategy.

We give a proof using the concept of ordinal game values.

Recall the ordinals...

0 1 2 · · · ω ω+1 · · · ω·2 ω·2+1 · · · ω·n+k · · · ω2

ω2+1 · · · ωn · · · ωω · · · ε0 · · · ωCh1

?= ωCK

1 · · · ω1 · · ·

Theory of infinite games Joel David Hamkins, New York

Page 33: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open Determinacy

Theorem (Gale,Stewart 1953)

Every open game is determined. One of the players has awinning strategy.

We give a proof using the concept of ordinal game values.

Recall the ordinals...

0 1 2 · · · ω ω+1 · · · ω·2 ω·2+1 · · · ω·n+k · · · ω2

ω2+1 · · · ωn · · · ωω · · · ε0 · · · ωCh1

?= ωCK

1 · · · ω1 · · ·

Theory of infinite games Joel David Hamkins, New York

Page 34: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open Determinacy

Theorem (Gale,Stewart 1953)

Every open game is determined. One of the players has awinning strategy.

We give a proof using the concept of ordinal game values.

Recall the ordinals...

0 1 2 · · · ω ω+1 · · · ω·2 ω·2+1 · · · ω·n+k · · · ω2

ω2+1 · · · ωn · · · ωω · · · ε0 · · · ωCh1

?= ωCK

1 · · · ω1 · · ·

Theory of infinite games Joel David Hamkins, New York

Page 35: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open Determinacy

Theorem (Gale,Stewart 1953)

Every open game is determined. One of the players has awinning strategy.

We give a proof using the concept of ordinal game values.

Recall the ordinals...

0 1 2 · · · ω ω+1 · · · ω·2 ω·2+1 · · · ω·n+k · · · ω2

ω2+1 · · · ωn · · · ωω · · · ε0 · · · ωCh1

?= ωCK

1 · · · ω1 · · ·

Theory of infinite games Joel David Hamkins, New York

Page 36: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open Determinacy

Theorem (Gale,Stewart 1953)

Every open game is determined. One of the players has awinning strategy.

We give a proof using the concept of ordinal game values.

Recall the ordinals...

0 1 2 · · · ω ω+1 · · · ω·2 ω·2+1 · · · ω·n+k · · · ω2

ω2+1 · · · ωn · · · ωω · · · ε0 · · · ωCh1

?= ωCK

1 · · · ω1 · · ·

Theory of infinite games Joel David Hamkins, New York

Page 37: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Open Determinacy

Theorem (Gale,Stewart 1953)

Every open game is determined. One of the players has awinning strategy.

We give a proof using the concept of ordinal game values.

Recall the ordinals...

0 1 2 · · · ω ω+1 · · · ω·2 ω·2+1 · · · ω·n+k · · · ω2

ω2+1 · · · ωn · · · ωω · · · ε0 · · · ωCh1

?= ωCK

1 · · · ω1 · · ·

Theory of infinite games Joel David Hamkins, New York

Page 38: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Game value

In any open game, we define the ordinal game value ofpositions:

A position that is already won has value 0.A position one move away from being won has value 1.

The values continue transfinitely:value is α+ 1, if white may play to a position with value α.if black to play, value is supremum of the values of thepositions to which black may play.

Some positions may be left without value.

White can play to strictly decrease value. Black can maintainvalue, but not increase it.

Theory of infinite games Joel David Hamkins, New York

Page 39: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Game values provide strategies

White wants to reduce value. From a valued position, white cando so.

Black wants to maintain value. He cannot increase it.

Conclusion

A position is winning for white if and only if it has an ordinalvalue.

White wins via the value-reducing strategy.

Black wins via the value-maintaining strategy.

Theory of infinite games Joel David Hamkins, New York

Page 40: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

Page 41: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

Page 42: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

Page 43: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Illustrating game value ω2

ω2 The initial value, with black to play.

ω · 3 + 17 Black must play to some ordinal below ω2.

ω · 3 + 16 White plays to reduce 1 each step, leading in 17 moves to

ω · 3 Black to play.

ω · 2 + 2014 Black must play below ω · 3

... Black survives another 2014 moves until...

ω · 2 Black to play.

ω + 10100 Black can now survive another googol many moves...

...ω Black to play.

G With Graham’s number, Black can survive a bit longer.

...0 Eventually, the value hits 0, at which time white wins.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Concrete meaning of the game values

Finite value n. . . . . . white can force a win in n moves, but not faster.

Value ω. . . . . . black to move, but every move leads to some (arbitrarilylarge) finite value n. Black will lose, but he can cause an arbitrarilylong delay.

Value ω + 10. . . . . . white can force value ω in 10 moves.

Value ω2. . . . . . black to play, but every move creates value ω · n + k .Think: n is the number of future announcements he will make, foreach of which play will take that long before the next announcement.

Value ω3. . . . . . black can announce an arbitrary number, which will bethe number of large announcements. Each large announcement isthe number of small announcements to be made; each smallannouncement is the number of moves before the nextannouncement.

Theory of infinite games Joel David Hamkins, New York

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Infinite chess

I’d like to illustrate various transfinite game values as they arisein the case of infinite chess.

However much I’d like to sit down in a cafe for a game of infinitechess, over espresso, nevertheless it remains a game purely ofthe mind.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Infinite chess

Infinite chess is chess played on an infinite edgeless chessboard, arranged like the integer lattice Z× Z.

The familiar chess pieces—kings, queens, bishops, knights,rooks and pawns—move about according to their usual chessrules, with bishops on diagonals, rooks on ranks and files andso on, with each player striving to place the opposing king intocheckmate.

There is no standard starting configuration in infinite chess, butrather a game proceeds by setting up a particular position onthe board and then playing from that position.

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Clarifying the rules

Let me clarify a few of the rules as they relate to infinite chess.

At most one king of each colorThere is no boundary, hence no pawn promotionThere is no castling and no en passantAbandon the 50 move rule as limitingInfinite play is a drawWe may abandon the three-fold repetition ruleFor arbitrary starting positions, one must clarify someweird boundary cases, e.g. White to move, black in check,white in checkmate

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Infinite chess is an open game

Checkmate, when it occurs, does so after finitely many moves.Infinite chess is therefore an open game, and thus subject tothe theory of transfinite game values.

So we can imagine chess positions with various large ordinalgame values.

(The possibility of draw does not significantly upset thetransfinite game value analysis.)

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZrZrZ0Z0Z0j0Z0Z0Z0Z0S0Z0Z0ZQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Black to move.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZ0ZrZ0Z0Z0j0Z0Z0Z0Z0S0Z0Z0ZQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Black moves up arbitrary height

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZ0ZrZ0Z0Z0jRZ0Z0Z0Z0Z0Z0Z0ZQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZkZrZ0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0ZQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZkZrZ0Z0ZQZRZ0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0ZrZ0ZrZ0Z0ZQZRZ0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0jRZ0Z0ZrZ0ZrZ0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0ZRZ0Z0ZrZ0ZrZ0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0ZQZRZ0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0Z0Z0Z0Z0Z0ZQZRZ0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0jRZ0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0ZQZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0Z0Z0Z0Z0Z0ZQZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0jRZ0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0ZQZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Theory of infinite games Joel David Hamkins, New York

Page 75: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0j0Z0Z0Z0Z0Z0Z0Z0ZQZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

A finite position with value ω

Z0Z0Z0Z0Z0Z0ZrZ0Z0Z0Z0jRZ0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZrZ0ZrZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Checkmate. Black can cause arbitrary delay, but the onlychoice is on first move, so the initial value is ω.

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Several infinite positions with value ω

OPZ0ZPOPOPO0Z0OPOPOPZ0ZPOPOPO0Z0OPOPOPZ0ZPAPOPO0jrOPOPOPo0oPSROPZPZPZPOPOBOBOBOPOPOPOPOPOPOPOPOPOPO

OPZ0ZPOPPO0Z0OPOOPZ0ZPOPPO0Z0OPOOPZ0ZPAPPO0jrOPOOPZpZPOPPO0O0OPOOPAPAPOPPOPOPLPOOPOPOPOP

Z0ZPO0OPO0Z0OPZPOPZ0ZPO0OPO0Z0OPZPOPZpZPO0OPO0Z0OPsPOPZ0ZPOBOPO0Z0OPjPOPZ0ZPSPSPO0Z0OPOPOPZ0ZPOPOPO

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Positions with value ω2

Z0ZPO0OPO0Z0Z0Z0OPZPOPZ0Z0Z0ZPO0OPO0Z0Z0o0OPZPOPZ0J0Z0ZPO0OPO0Z0Z0Z0OPsPOPZ0Z0Z0ZPOBOPO0Z0Z0Z0OPjPOPZ0Z0Z0ZPSPSPO0s0Z0Z0OPOPOPZ0Z0Z0ZPOPOPO0Z0Z

Z0ZPO0OPOPZ0Z0Z0Z0OPZPOPO0Z0Z0ZpZPO0OPOPZ0Z0Z0Z0OPZPOPO0Z0Z0Z0ZPO0jPOPZKZ0Z0Z0OPsPZPO0Z0Z0Z0ZPOBOBOPZ0s0Z0Z0OPOPOPO0Z0Z0Z0ZPOPOPOPZ0Z0Z0Z0OPOPOPO0Z0Z0Z0ZPOPOPOPZ0Z0Z

Z0ZPO0OPOPOPZ0Z0Z0Z0OPZPOPOPO0Z0Z0Z0ZPO0OPOPOPZ0Z0Z0Z0OPsPOPOPO0Z0Z0ZpZPO0OPOPOPZ0J0Z0Z0OPZPOPOPO0Z0Z0Z0ZPONOPjPOPZ0Z0Z0Z0OPOPMPMPO0s0Z0Z0ZPOPOPOPOPZ0Z0Z0Z0OPOPOPOPO0Z0Z0Z0ZPOPOPOPOPZ0Z0Z

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0ZrZ0Z0Z0Z0Z0Z0Z00Z0ZPZPZKZ0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OrO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Black to move.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OrO0Z0ZrZ0Z0Z0Z0Z0Z0Z00Z0ZPZPZKZ0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

He moves trapped rook up arbitrary height.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0ZrZ0Z0Z0Z0Z0Z0Z00Z0Z0ZPZKZ0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

White should capture from left side.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZKZ0s0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Now black begins to harass white king.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0ZKZ0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0s0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

White must chase down the rook to avoid perpetual check.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0ZKZrZ0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0ZrZ0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0ZKZ0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0ZrZ0Z0Z0Z0Z00Z0Z0ZPZ0ZKZ0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Black must move away to save rook.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0ZrZ0Z0Z0Z0Z00Z0ZPZPZ0ZKZ0Z0Z0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Now is white’s chance to advance a pawn.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0ZKZ0Z0s0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0ZKZ0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0s0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0ZKZ0ZrZ0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0ZrZ0Z0Z0Z0Z00Z0ZPZPZ0Z0ZKZ0Z0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0ZKZ0s0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0ZKZ0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0s0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0ZKZrZ0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0ZrZ0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0ZKZ0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0ZrZ00Z0ZPZPZ0Z0Z0ZKZ0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Black moves arbitrary distance out.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0ZrZ00Z0ZPZPZ0Z0Z0ZKZ0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Another chance to advance a pawn.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0ZKZ0Z0Z0Z0s0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Black harasses the white king.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0ZKZ0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0s0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

White must chase him down.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0ZKZ0Z0Z0ZrZ00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0ZrZ00Z0ZPZPZ0Z0Z0Z0ZKZ0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0ZKZ0Z0Z0s0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0ZKZ0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0s0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0ZKZ0Z0ZrZ00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0ZrZ00Z0ZPZPZ0Z0Z0Z0Z0ZKZ0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0ZKZ0Z0s0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0ZKZ0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0s0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0ZKZ0ZrZ00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0ZrZ00Z0ZPZPZ0Z0Z0Z0Z0Z0ZKZ0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0ZKZ0s0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0ZKZ0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0s0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0ZKZrZ00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0Z0Z0Z0Z0ZrZ00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0ZKZ0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0ZrZ0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0ZKZ0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

(Black should actually move arbitrary distance to the right.)

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0ZrZ0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0ZKZ0ZZ0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPAPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0ZrZ0Z0Z0Z0Z00Z0ZPZPZ0ZKZ0Z0Z0Z0Z0Z0Z0ZZ0A0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

The bishop unlocks the door.

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

Z0Z0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0OPO0Z0Z0Z0ZrZ0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0ZKZ0Z0Z0Z0Z0ZZ0A0O0O0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0QZ0ZPZPZ0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0OPO0Z0Z0Z0Z0Z0Z0Z0Z0Z0QLQZ0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZLQZ0ZPZkZ0Z0Z0Z0Z0Z0Z0Z0Z0QZ0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0O0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Black can move rook arbitrary distance.

Theory of infinite games Joel David Hamkins, New York

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Transfinite game values in infinite chess

Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Releasing the Hordes, with value ω2

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Queens enter the mating chamber.

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Releasing the Hordes, with value ω2

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Checkmate

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Black to move.

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The first black tower ascends.

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Black harasses white king.

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Black should actually move arbitrary distance right.

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White advances a pawn.

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Black should actually move arbitrary distance right.

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White advances pawn.

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Black should actually move arbitrary distance right.

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White advances pawn.

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Black should actually move arbitrary distance right.

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White advances pawn.

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Black should actually move arbitrary distance right.

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White advances pawn.

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Black should actually move arbitrary distance right.

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Black should actually move arbitrary distance right.

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Black should actually move arbitrary distance right.

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Black should actually move arbitrary distance right.

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Black should actually move arbitrary distance right.

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Black key pawn attacks second tower.

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Second tower ascends.

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Iterated lock and key, value ω2 · 4

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Black should actually move arbitrary distance right.

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Iterated lock and key, value ω2 · 4

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Iterated lock and key, value ω2 · 4

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Iterated lock and key, value ω2 · 4

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Iterated lock and key, value ω2 · 4

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Iterated lock and key, value ω2 · 4

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Black should actually move arbitrary distance right.

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Transfinite game values in infinite chess

State of the art: value ω3

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ZPZBOBoPZ0oPZBOBZPoPZ0oPZ0ZPOBoPZ0oPZ0ZBOBoPZ0oPZ0Z0ZPoPZ0oPZ0Z0ZBoPZ0oPZ0Z0Z0oPZ0oPZ0Z0Z0ZPZ0oPZ0Z0Z0Z0Z0oPZ0Z0Z0Z0Z0oPZ0Z0Z0Z0Z0oPZ0Z0Z0Z0Z0ZPZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

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Transfinite game values in infinite chess

The omega one of chess

ωCh1 = supremum of values of finite positions in infinite chess

ωCh∼1 = supremum of values of all valued positions

Question

How big is the omega one of chess?

ωCh1 ≤ ω

CK1

ωCh∼1 ≤ ω1

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Transfinite game values in infinite chess

The omega one of chessConjecture (Evans, Hamkins)

The omega one of chess is as large as it could be.

ωCh1 = ωCK

1 ωCh∼1 = ω1.

The best lower bounds are still very small...

ω · n + k < ωCh1 ≤ ω

CK1

ω3 · 4 < ωCh∼1 ≤ ω1

But we conjecture that the upper bounds are met.

We haven’t been able yet to prove this in two-dimensionalinfinite chess (but meanwhile, in three dimensions...)

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Computability

Let’s explore a few computability issues that arise in connectionwith infinite chess.

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Computable strategies

Deterministic computable strategies

A position is computable if there is a computable function givingthe locations and number of the pieces. (Complications...)

Consider that the players will both play according todeterministic computable strategies.

Question

Will that requirement affect our judgement of whether a positionis winning?

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Computable strategies

Requiring computable play matters

Yes. Requiring players to play according to a deterministiccomputable procedure can affect our judgement of whether agiven computable position is drawn or a win.

Theorem

There is a position in infinite chess such that:1 The position is computable.2 The position is drawn. Neither player has a winning

strategy, and either player can force a draw.3 But among computable strategies, the position is a win for

white. White has a computable strategy defeating everycomputable strategy for black.

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Computable strategies

A position where computable play mattersFix a computable tree T ⊆ 2<ω with no computable branch.

ZPSRSRSRA0ARSRSRS0ORSRSRA0ARSRSRSRZPSRSRA0ARSRSRARS0ORSRSRA0ARSRA0ARZPSRSRSRA0ARAPARS0ORSRSRSRA0A0ORSRZPSRARSRSRA0ARSRS0ORA0ARSRA0ARSRSRZPSRAPARA0ARSRSRA0ORSRO0A0ARSRSRA0ZPSRSRA0ARSRSRA0A0ORSRSRA0ARSRA0ARZPSRSRSRA0ARA0ARS0ORSRSRSRA0A0ARSRZPSRSRSRSRA0ARSRS0ORSRSRSRAkARSRSRZPSRSRSRA0ARSRSRS0ORSRSRAKARSRSRSRZPSRSRA0ARSRSRSRS0ORSRSRARSRSRSRSRZPSRSRSRSRSRSRSRS0OPOPOPOPOPOPOPOPZ0Z0Z0Z0Z0Z0Z0Z0Z White forces black to climb the

tree; black hopes to avoid the dead-end traps.

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The mate-in-n problem

There is a genre of chess problems, the mate-in-n problems

White to mate in 2Black to mate in 3

Consider the corresponding class of problems in infinite chess.

The mate-in-n problem

Given a finite position in infinite chess, can a designated playerforce a win in at most n moves?

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A mate-in-12 problem

White to move on an infinite, edgeless board.

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0Z0Z0ZKZ0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Can white force mate in 12 moves?

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Computable strategies

The mate-in-n problem

Question

Is the mate-in-n problem computably decidable?

A naive formulation of white to mate-in-3, with white to move:There is a white move, such that for every black reply,there is a white move, such that for every black reply,there is a white move that delivers checkmate.

∃w1∀b1∃w2∀b2∃w3 · · ·

Very high arithmetical complexity, 2n alternating quantifiers.

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Computable strategies

Infinite game tree

In finite n × n chess, one can search the entire game tree,which is finite.

In infinite chess, the game tree is not only infinite, but infinitelybranching. The unbounded pieces (queens, rooks, bishops)may have infinitely many possible moves.

Thus, one cannot expect computably to search the entire gametree, even to finite depth.

The naive, brute-force-search manner of deciding the mate-in-nproblem is simply inadequate.

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The infinitary mate-in-n problem is decidable

Theorem (Brumleve, Hamkins, Schlicht)

The mate-in-n problem of infinite chess is decidable.

Further, there is a computable strategy for optimal play from anymate-in-n position.

Two proof methods:

The structure of chess Ch, the space of all chess positions, withchess concept relations, is an automatic structure, whose theoryis therefore decidable.

The structure of chess is encodable in Presburger arithmetic〈Z,+, <〉, whose theory is decidable.

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The winning-position problem still open

Our theorem does not show that the winning-position problemis decidable.

Question (Richard Stanley)

Is the winning-position problem for infinite chess decidable?

This question remains open, and is MathOverflow-hard.

The point is that a player may have a winning strategy from aposition, but it is not mate-in-n for any n. So it is not clear thatthe winning positions are even c.e., or even arithmetic orhyperarithmetic.

These positions are precisely the positions with transfinitegame value.

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3D chess

Let us turn to three-dimensional chess.

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Infinite 3D chess

3D chessThe history of 3D chess spans more centuries than you might expect:

19th century: Kieseritzkys Kubikschack in 1851.

early 20th century: Maacks raumschach chess clubs, Hamburgfrom 1919 (first 8× 8× 8, then 5× 5× 5)

late 20th century: I played 8× 8× 3 chess as a child.

23rd century: Spock and Kirk play on several Star Trek episodes.

StarTrekChess.jpg

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Infinite 3D chess

3D chessThe history of 3D chess spans more centuries than you might expect:

19th century: Kieseritzkys Kubikschack in 1851.

early 20th century: Maacks raumschach chess clubs, Hamburgfrom 1919 (first 8× 8× 8, then 5× 5× 5)

late 20th century: I played 8× 8× 3 chess as a child.

23rd century: Spock and Kirk play on several Star Trek episodes.

StarTrekChess.jpg

Theory of infinite games Joel David Hamkins, New York

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Infinite 3D chess

3D chessThe history of 3D chess spans more centuries than you might expect:

19th century: Kieseritzkys Kubikschack in 1851.

early 20th century: Maacks raumschach chess clubs, Hamburgfrom 1919 (first 8× 8× 8, then 5× 5× 5)

late 20th century: I played 8× 8× 3 chess as a child.

23rd century: Spock and Kirk play on several Star Trek episodes.

StarTrekChess.jpg

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

3D chessThe history of 3D chess spans more centuries than you might expect:

19th century: Kieseritzkys Kubikschack in 1851.

early 20th century: Maacks raumschach chess clubs, Hamburgfrom 1919 (first 8× 8× 8, then 5× 5× 5)

late 20th century: I played 8× 8× 3 chess as a child.

23rd century: Spock and Kirk play on several Star Trek episodes.

StarTrekChess.jpg

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Infinite 3D chess

Infinite 3D chess

We consider infinite three-dimensional chess, 3D chess oninfinite boards with no boundary.

One must specify the piece movement; there is room forreasonable disagreement.

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Infinite 3D chess

The omega one of 3D infinite chess

Theorem (Evans, Hamkins)

The ω1 of infinite 3D chess with infinite positions is true ω1, aslarge as it could possibly be.

ωCh3∼1 = ω1

Every countable ordinal therefore arises as the game value of aposition in three-dimensional infinite chess.

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The ω1 of 3D infinite chess

The basic idea is to code an arbitrary well-founded tree T ⊆ ωωas a position in infinite chess.

Every such tree admits an ordinal ranking function.

We create a chess position that is like climbing through such awell-founded tree.

The difficulty is that the tree must be infinite-branching toachieve large ranks. How to force black to make a choice?

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Infinite 3D chess

Embedding a tree into 3 space

We embed the tree, with the infinite-branching nodes of Tsimulated individually on separate layers

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Infinite 3D chess

Ascending stairs in 3D chess

9 Z0Z0Z0Z0Z8 0Z0Z0Z0Z07 Z0Z0Z0Z0Z6 0Z0Z0Z0Z05 Z0ZPZPZ0Z4 0Z0O0O0Z03 Z0ZpOpZ0Z2 0Z0OpO0Z01 Z0Z0O0Z0Z

a b c d e f g h i

α

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β

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γ

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δ

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Z0Z0Z0Z0Z 3

0Z0Z0Z0Z0 2

Z0Z0Z0Z0Z 1

a b c d e f g h i

ε

The black king is forced to ascend the stairs via

1.αe4+ Kγe6 2.βe5+ Kδe7 3.γe6+ Kεe8 4.δe7+.

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Infinite 3D chess

Branching node layer in 3D infinite chess

6 0Z0Z05 Z0Z0Z4 0O0O03 ZPZPZ2 0oPo01 ZPoPZ0 0ZPZ0

c d e f g

ω

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c d e f g

α

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β

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a b c d e f g h i j k l m n o p q r s t u v w x y

γ

Black has mate-in-2 elsewhere. Play is tightly forced. Transitionfrom stairwell to branching layer γ; additional pawns in layerabove and below will confine black king to the channel.

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Infinite 3D chess

The omega one of infinite 3D chessSummary of the argument:

Every well-founded tree T can be embedded into aposition of infinite 3D chess.Chess play from those positions corresponds toclimbing-through-T .Thus, the rank of T is a lower bound for the game value ofthe position.Consequently, the values of positions in infinite 3D chessare unbounded in ω1.

The ω1 of infinite 3D chess, therefore, is true ω1, as large as itcould possibly be.

ωCh3∼1 = ω1

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Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0Z0Z0ZKZ0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White to move.

White mates in 13, but not 12. The kings must come together.

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Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0Z0Z0ZKZ0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

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Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0Z0Z0Z0ZKZ0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0Z0Z0Z0ZKZ0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

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Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0Z0ZKZ0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

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Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0Z0ZKZ0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

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Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0Z0Z0ZKZ0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0Z0Z0ZKZ0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 459: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0ZKZ0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 460: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0ZKZ0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 461: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0Z0ZKZ0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 462: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0Z0ZKZ0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0ZKZ0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 464: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0ZKZ0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0ZKZ0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 466: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0ZKZ0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 467: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0ZKZ0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 468: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0ZKZ0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 469: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0ZKZ0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 470: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0ZKZ0Z0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 471: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0ZKZ0Z0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 472: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0ZKZ0Z0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 473: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0ZKZ0Z0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 474: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0ZKZ0Z0Z0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 475: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZKZ0Z0Z0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

Page 476: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Infinite 3D chess

Solution to the mate-in-13 problemLastly, let’s give the solution of the mate-in-13 problem.

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZKZ0Z0Z0Z0Z0Z0Z0Z0Z0ZRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Checkmate

White mates in 13, but not 12. The kings must come together.

Theory of infinite games Joel David Hamkins, New York

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Infinite 3D chess

Thank you.

C. D. A. Evans, J. D. Hamkins, “Transfinite game values in infinitechess,” to appear in Integers Journal.

D. Brumleve, J. D. Hamkins, and P. Schlicht, “The mate-in-nproblem of infinite chess is decidable,” in How the worldcomputes, S. Cooper, A. Dawar, and B. Lowe, Ed., SpringerBerlin Heidelberg, 2012, vol. 7318, pp. 78-88.

Slides and articles available on http://jdh.hamkins.org.

Joel David HamkinsThe City University of New York

Theory of infinite games Joel David Hamkins, New York

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New starting procedureFrom the December 2011 IBM Ponder This problem.

White places any number of queens on the board. Black thenplaces his king anywhere, and play commences.

Question

How many queens suffice to ensure checkmate?

Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZQLQZQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0LQL0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0LQZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZkZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Theory of infinite games Joel David Hamkins, New York

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Two queens suffice

First, trap the king in a column. Then move a knight’s moveaway, then again a knight’s move away.

0Z0Z0ZZ0L0Z00Z0Z0ZZ0Z0Z00Z0j0ZZ0Z0Z00Z0Z0ZZ0Z0Z00Z0ZQZZ0Z0Z0

Black to move.

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Two queens suffice

First, trap the king in a column. Then move a knight’s moveaway, then again a knight’s move away.

0Z0Z0ZZ0L0Z00Z0Z0ZZ0Z0Z00Z0j0ZZ0Z0Z00Z0ZQZZ0Z0Z00Z0Z0ZZ0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Two queens suffice

First, trap the king in a column. Then move a knight’s moveaway, then again a knight’s move away.

0Z0Z0ZZ0L0Z00Z0Z0ZZ0ZkZ00Z0Z0ZZ0Z0Z00Z0ZQZZ0Z0Z00Z0Z0ZZ0Z0Z0

Theory of infinite games Joel David Hamkins, New York

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Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

Two queens suffice

First, trap the king in a column. Then move a knight’s moveaway, then again a knight’s move away.

0Z0Z0ZZ0L0Z00Z0Z0ZZ0ZkZ00ZQZ0ZZ0Z0Z00Z0Z0ZZ0Z0Z00Z0Z0ZZ0Z0Z0

Checkmate

Theory of infinite games Joel David Hamkins, New York

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How many rooks do you need?

Consider the similar problem, where white places rooks, andthen black places a king.

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0SRS0S0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZRSRZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZRS0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0j0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

How many rooks suffice?

Theory of infinite games Joel David Hamkins, New York

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Three rooks are necessary

Clearly, with three rooks, we can do it.

0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0S0Z0Z0Z0Z0Z0Z0Z0Z00Z0Z0Z0Z0ZkZ0Z0Z0Z0ZZ0Z0Z0Z0Z0Z0Z0ZRZ0Z00Z0ZRZ0Z0Z0Z0Z0Z0Z0ZZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Black to move.

Two rooks are insufficient, since there is no checkmate positionwith two rooks.

Theory of infinite games Joel David Hamkins, New York

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Three rooks are necessary

Clearly, with three rooks, we can do it.

0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0S0Z0Z0Z0Z0Z0Z0Z0Z00Z0ZRZ0Z0ZkZ0Z0Z0Z0ZZ0Z0Z0Z0Z0Z0Z0ZRZ0Z00Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Checkmate

Two rooks are insufficient, since there is no checkmate positionwith two rooks.

Theory of infinite games Joel David Hamkins, New York

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How many bishops

0Z0Z0Z0Z0Z0Z0Z0Z0Z0ZZ0ABZ0Z0Z0Z0Z0Z0Z0Z00Z0ABA0Z0Z0Z0j0Z0Z0ZZ0ABZ0Z0Z0Z0Z0Z0Z0Z00Z0ABA0Z0Z0Z0Z0Z0Z0ZZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

How many bishops do you need?

Theory of infinite games Joel David Hamkins, New York

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Six bishops required

Six suffice: use two pairs of two to close two walls. Extra bishop(of correct color) delivers checkmate

0Z0Z0Z0Z0Z0ZBZ0Z0Z0ZZ0Z0Z0Z0Z0Z0A0Z0Z0Z00Z0Z0Z0Z0j0Z0Z0Z0Z0ZZ0A0Z0Z0Z0Z0Z0Z0Z0Z00ZBZ0Z0Z0Z0Z0ABZ0Z0ZZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0

Black to move.

Five do not suffice: the black king will stay on the color havingat most two bishops of that color. There is always a free move(or stalemate), since double check cannot arise.

Theory of infinite games Joel David Hamkins, New York

Page 488: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0Z0Z0Z0Z0Z0Z0Z0ZNMNMNMNZkZ0Z0Z0Z0Z0Z0MNMNZNM0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Black to move.

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 489: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0M0Z0Z0Z0Z0Z0Z0Z0ZNMNM0MNZkZ0Z0Z0Z0Z0Z0MNMNZNM0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 490: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0M0Z0Z0Z0Z0Z0Z0Z0ZNMNM0MNZ0j0Z0Z0Z0Z0Z0MNMNZNM0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 491: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0M0Z0Z0Z0Z0Z0Z0Z0ZNMNM0ZNZ0j0Z0Z0Z0Z0Z0MNMNZNM0ZNZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 492: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0M0Z0Z0Z0Z0Z0Z0Z0ZNMNM0ZNZ0ZkZ0Z0Z0Z0Z0MNMNZNM0ZNZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 493: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0M0M0Z0Z0Z0Z0Z0Z0ZNMNM0Z0Z0ZkZ0Z0Z0Z0Z0MNMNZNM0ZNZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Check

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 494: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0M0M0Z0Z0Z0Z0Z0Z0ZNMNM0Z0Z0Z0j0Z0Z0Z0Z0MNMNZNM0ZNZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 495: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0M0Z0Z0Z0Z0Z0Z0ZNMNM0Z0ZNZ0j0Z0Z0Z0Z0MNMNZNM0ZNZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 496: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0M0Z0Z0Z0Z0Z0Z0ZNMNM0Z0ZNZ0ZkZ0Z0Z0Z0MNMNZNM0ZNZ0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 497: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0M0Z0Z0Z0Z0Z0Z0ZNMNM0Z0ZNM0ZkZ0Z0Z0Z0MNMNZNM0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 498: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0M0Z0Z0Z0Z0Z0Z0ZNMNM0Z0ZNM0Z0j0Z0Z0Z0MNMNZNM0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 499: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0M0Z0Z0Z0Z0Z0Z0ZNMNM0Z0Z0M0Z0j0Z0Z0Z0MNMNZNM0Z0Z0M0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 500: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0M0Z0Z0Z0Z0Z0Z0ZNMNM0Z0Z0M0Z0ZkZ0Z0Z0MNMNZNM0Z0Z0M0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 501: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0Z0Z0Z0Z0Z0Z0Z0ZNMNM0Z0Z0MNZ0ZkZ0Z0Z0MNMNZNM0Z0Z0M0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 502: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0Z0Z0Z0Z0Z0Z0Z0ZNMNM0Z0Z0MNZ0Z0j0Z0Z0MNMNZNM0Z0Z0M0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 503: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0Z0ZNZ0Z0Z0Z0Z0ZNMNM0Z0Z0ZNZ0Z0j0Z0Z0MNMNZNM0Z0Z0M0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York

Page 504: An introduction to the theory of infinite games, with ...

Infinite games and transfinite game values Infinite chess Computability Higher dimensions Extras

How many knights?

0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0MNMNZNMNZ0Z0Z0Z0Z0Z0Z0Z0ZNMNMNM0Z0Z0ZNZ0Z0Z0Z0Z0ZNMNM0Z0Z0ZNZ0Z0ZkZ0Z0MNMNZNM0Z0Z0M0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z0Z

Is this enough to ensure checkmate?

No, black can outrun the knights, since two knights areinsufficient to checkmate.

Theory of infinite games Joel David Hamkins, New York


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