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python-chess supports several chess variants.

Variant

Board class

UCI/XBoard

Syzygy

Standard

chess/normal

.rtbw, .rtbz

Suicide

chess.variant.SuicideBoard

suicide

.stbw, .stbz

Giveaway

chess.variant.GiveawayBoard

giveaway

.gtbw, .gtbz

Antichess

chess.variant.AntichessBoard

antichess

.gtbw, .gtbz

Atomic

chess.variant.AtomicBoard

atomic

.atbw, .atbz

King of the Hill

chess.variant.KingOfTheHillBoard

kingofthehill

Racing Kings

chess.variant.RacingKingsBoard

racingkings

Horde

chess.variant.HordeBoard

horde

Three-check

3check

Crazyhouse

crazyhouse

Each variant will teach you something new and interesting about chess. They are fun to play, and they will sharpen your mind and your chess skills. If you get tired of playing normal chess, you can enjoy these fun chess variants. Give Away Chess: The object of the game is to give away all your pieces. The first person to lose all their pieces wins.

chess.variant.find_variant(name:str) → Type[chess.Board][source]
Chess

Looks for a variant board class by variant name. Supports many commonaliases.

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Game end¶

See chess.Board.is_variant_end(), is_variant_win(),is_variant_draw(),or is_variant_loss() for special variant end conditionsand results.

Note that if all of them return False, the game may still be over anddecided by standard conditions like is_checkmate(),is_stalemate(),is_insufficient_material(), move counters, repetitions,and legitimate claims.

Chess960¶

Chess960 is orthogonal to all other variants.

See chess.BaseBoard.set_chess960_pos(),chess960_pos(), andfrom_chess960_pos() for dealing with Chess960 startingpositions.

Crazyhouse¶

class chess.variant.CrazyhousePocket(symbols:Iterable[str]=')[source]

A Crazyhouse pocket with a counter for each piece type.

Variants
add(piece_type:int) → None[source]

Adds a piece of the given type to this pocket.

remove(piece_type:int) → None[source]

Removes a piece of the given type from this pocket.

count(piece_type:int) → int[source]

Returns the number of pieces of the given type in the pocket.

reset() → None[source]

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Clears the pocket.

copy() → CrazyhousePocketT[source]

Returns a copy of this pocket.

Best Chess Variants

class chess.variant.CrazyhouseBoard(fen:Optional[str]='rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR[] w KQkq - 0 1', chess960:bool=False)[source]
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pockets = [chess.variant.CrazyhousePocket(), chess.variant.CrazyhousePocket()]

Pockets for each color. For example, board.pockets[chess.WHITE]are the pocket pieces available to White.

legal_drop_squares() → chess.SquareSet[source]

Gets the squares where the side to move could legally drop a piece.Does not check whether they actually have a suitable piece in theirpocket.

It is legal to drop a checkmate.

Returns a setofsquares.

Three-check¶

class chess.variant.ThreeCheckBoard(fen:Optional[str]='rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 3+3 0 1', chess960:bool=False)[source]
remaining_checks = [3, 3]

Remaining checks until victory for each color. For example,board.remaining_checks[chess.WHITE]0 implies that White has won.

UCI/XBoard¶

Multi-Variant Stockfish and other engines have an UCI_Variant option.XBoard engines may declare support for variants.This is automatically managed.

Syzygy¶

Syzygy tablebases are available for suicide, giveaway and atomic chess.