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Losing chess (also known as antichess, the losing game, giveaway chess, suicide chess, killer chess, must-kill, take-all chess, take-me chess, capture chess or losums) is one of the most popular chess variants. [1] [2] The objective of each player is to lose all of their pieces or be stalemated, that is, a misère version. In some variations, a player may also win by checkmating or by being checkmated.
Losing chess was weakly solved in 2016 by Mark Watkins as a win for White, beginning with 1.e3.
The rules are the same as those for standard chess, except for the following special rules:
Draws by repetition, agreement, or the fifty-move rule work as in standard chess. Positions when neither player can win are also draws: for example, when the only pieces remaining are bishops of opposite colors . (This is similar to the dead position rule in standard chess.)
The origin of the game is unknown, but believed to significantly predate an early version, named take me, played in the 1870s. [3] Because of the popularity of losing chess, several variations have spawned. The most widely played (main variant) is described in Popular Chess Variants by D. B. Pritchard. Losing chess began to gain popularity in the 20th century, which was facilitated by some publications about this variant in the UK, Germany, and Italy.
Losing chess gained a new surge in popularity at the turn of the 20th and 21st centuries as an online game, thanks to the implementation of this variant on FICS in 1996, which greatly contributed to the popularization of losing chess. [4] International tournaments were held in 1998 and 2001. [5] [6]
The internet chess server Lichess facilitates play of the game, referring to it as "antichess"; [4] after regular chess it is the most popular variant on the site in terms of numbers of games played. [7] Since 2018 the site has hosted an annual "Lichess World Championship" for the variant. [4] [8] Chess.com also added this variant to their server, calling it "giveaway." [9]
Because of the forced capture rule, losing chess games often involve long sequences of forced captures by one player. This means that a minor mistake can doom a game. Such mistakes can be made from the very first move—it is currently known that a Black win can be forced after 13 of White's 20 legal opening moves. [10] [11] Some of these openings took months of computer time to solve: they vary greatly in difficulty.
In the table below, green marks winning first moves for White; red marks losing first moves; and yellow marks moves that are not yet solved.
Na3 | Nc3 | Nf3 | Nh3 | ||||
a4 | b4 | c4 | d4 | e4 | f4 | g4 | h4 |
a3 | b3 | c3 | d3 | e3 | f3 | g3 | h3 |
This main variant of losing chess was weakly solved in October 2016; White is able to force a win beginning with 1.e3. [12] This solution is valid for both FICS and "International" rules on stalemate. Some lines are trivial (1...d6, 1...d5, 1...Na6, and 1...g6 lose in less than 20 moves), others are quite simple (1...Nf6, 1...h6, 1...e5, 1...f5, 1...h5, 1...f6, 1...a6, 1...a5 lose in less than 30 moves, subject to knowledge of the theory [13] ), and some are quite complicated (1...Nh6, 1...Nc6, 1...c6, the win in which may require about 60 moves [13] ). The most difficult are the following five openings [14] (in order of increasing difficulty): 1.e3 g5 (Wild Boar Defence), 1.e3 e6 (Modern Defence), 1.e3 b5 (Classical Defence), 1.e3 c5 (Polish Defence), and 1.e3 b6 (Liardet Defence).
David Pritchard, the author of The Encyclopedia of Chess Variants, wrote that the "complexity and beauty" of losing chess is found in its endgame. He noted that, in contrast to regular chess, losing chess endgames with just two pieces require considerable skill to play correctly, whereas three- or four-piece endgames can exceed human capacity to solve precisely. [15] For example, the following endgames may turn out to be quite complicated: 2 Knights vs Rook, 3 Kings vs King, or Bishop+Knight+King vs King. [16] [17] In the latter case, in particular, a win may require more than 60 moves, which means that it is sometimes unattainable due to the fifty-move rule.
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a | b | c | d | e | f | g | h |
Implementations of the main variant can vary in regard to stalemate. [18] "International" rules are as described above, with the stalemated player winning even if that player still has pieces on the board. FICS rules resolve stalemate as a win for the player with the fewer number of pieces remaining; if both have the same number, it is a draw (the piece types are irrelevant). "Joint" FICS/International rules resolves stalemate as a draw unless it is a victory for the same player under both rulesets. [12] The stalemate in the diagram is a win for White under "International" rules, a win for Black under FICS rules, and a draw under "joint" rules.
Pritchard discusses the following variants of the game in The Encyclopedia of Chess Variants. [19]
Variant 2
Rules are the same as the main rules, except:
Variant 3
Rules are the same as the main rules, except:
Variant 4
Rules are the same as variant 3, except:
Alice chess is a chess variant invented in 1953 by V. R. Parton which employs two chessboards rather than one, and a slight alteration to the standard rules of chess. The game is named after the main character "Alice" in Lewis Carroll's work Through the Looking-Glass, where transport through the mirror into an alternative world is portrayed on the chessboards by the after-move transfer of chess pieces between boards A and B.
Progressive chess is a chess variant in which players, rather than just making one move per turn, play progressively longer series of moves. The game starts with White making one move, then Black makes two consecutive moves, White replies with three, Black makes four and so on. Progressive chess can be combined with other variants; for example, when Circe chess is played as a game, it is usually progressively. Progressive chess is considered particularly apt for playing correspondence chess using mail or some other slow medium, because of the relatively small number of moves in a typical game.
Stalemate is a situation in chess where the player whose turn it is to move is not in check and has no legal move. Stalemate results in a draw. During the endgame, stalemate is a resource that can enable the player with the inferior position to draw the game rather than lose. In more complex positions, stalemate is much rarer, usually taking the form of a swindle that succeeds only if the superior side is inattentive. Stalemate is also a common theme in endgame studies and other chess problems.
Tamerlane chess is a medieval chess variant. Like modern chess, it is derived from shatranj. It was developed in Central Asia during the reign of Emperor Timur, and its invention is also attributed to him. Because Tamerlane chess is a larger variant of chaturanga, it is also called Shatranj Al-Kabir, as opposed to Shatranj as-saghir. Although the game is similar to modern chess, it is distinctive in that there are varieties of pawn, each of which promotes in its own way.
Maharajah and the Sepoys, originally called Shatranj Diwana Shah and also known as the Mad King's Game, Maharajah chess, or Sarvatobhadra "auspicious on all sides", is a popular chess variant with different armies for White and Black. It was first played in the 19th century in India. It is a solved game with a forced win for Black.
Kriegspiel is a chess variant invented by Henry Michael Temple in 1899 and based upon the original Kriegsspiel developed by Georg von Reiswitz in 1812. In this game, each player can see their own pieces but not those of their opponent. For this reason, it is necessary to have a third person act as an umpire, with full information about the progress of the game. Players attempt to move on their turns, and the umpire declares their attempts 'legal' or 'illegal'. If the move is illegal, the player tries again; if it is legal, that move stands. Each player is given information about checks and captures. They may also ask the umpire if there are any legal captures with a pawn. Since the position of the opponent's pieces is unknown, Kriegspiel is a game of imperfect information.
Checkless chess, also known as prohibition chess, is a chess variant where neither player may give check unless it is checkmate. All other rules are as in regular chess. The origin of the game is unknown, dating from the mid-19th century. The variant is a popular problem theme, usually requiring a fairy mate.
In chess, promotion is the replacement of a pawn with a new piece when the pawn is moved to its last rank. The player replaces the pawn immediately with a queen, rook, bishop, or knight of the same color. The new piece does not have to be a previously captured piece. Promotion is mandatory when moving to the last rank; the pawn cannot remain as a pawn.
Knight relay chess is a chess variant invented by Mannis Charosh in 1972. In this game, knights relay their power to friendly pieces.
Hexagonal chess is a group of chess variants played on boards composed of hexagon cells. The best known is Gliński's variant, played on a symmetric 91-cell hexagonal board.
Monochromatic chess is a chess variant with unknown origin. The initial board position and all rules are the same as in regular chess, except that pieces that begin on a black square must always stay on a black square and pieces that begin on a white square must always stay on a white square. This would mean that knights can never move, but The Classified Encyclopedia of Chess Variants says that knights make a double jump. It has been suggested that a knight be replaced with a (3,1)-leaper (camel).
Three-player chess is a family of chess variants specially designed for three players. Many variations of three-player chess have been devised. They usually use a non-standard board, for example, a hexagonal or three-sided board that connects the center cells in a special way. The three armies are differentiated usually by color.
In chess and chess variants, a bare king is a king whose player has no other remaining pieces.
The following outline is provided as an overview of and topical guide to chess:
Wildebeest chess is a chess variant created by R. Wayne Schmittberger in 1987. The Wildebeest board is 11×10 squares. Besides the standard chess pieces, each side has two camels and one "wildebeest" - a piece which may move as either a camel or a knight.
Chessence is a chess variant invented by Jim Winslow in 1989. The board is a 6×9 rectangle of squares with eight squares missing. Each player has a king and nine men with initial setup as shown, including three men initially not yet in play at the side of the board. To win, a player must checkmate or stalemate the opponent.
Tri-chess is the name of a chess variant for three players invented by George R. Dekle Sr. in 1986. The game is played on a board comprising 150 triangular cells. The standard chess pieces are present, minus the queens, and plus the chancellor and cardinal compound fairy pieces per side.
Three-man chess is a chess variant for three players invented by George R. Dekle Sr. in 1984. The game is played on a hexagonal board comprising 96 quadrilateral cells. Each player controls a standard army of chess pieces.
Quatrochess is a chess variant for four players invented by George R. Dekle Sr. in 1986. It is played on a square 14×14 board that excludes the four central squares. Each player controls a standard set of sixteen chess pieces, and additionally nine fairy pieces. The game can be played in partnership or all-versus-all.
Hostage chess is a chess variant invented by John A. Leslie in 1997. Captured pieces are not eliminated from the game but can reenter active play through drops, similar to shogi. Unlike shogi, the piece a player may drop is one of their own pieces previously captured by the opponent. In exchange, the player returns a previously captured enemy piece which the opponent may drop on a future turn. This is the characteristic feature of the game.
Bibliography