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In chess, the threefold repetition rule states that a player may claim a draw if the same position occurs three times during the game. The rule is also known as repetition of position and, in the USCF rules, as triple occurrence of position. [ 1] Two positions are by definition "the same" if the same types of pieces occupy the same squares, the ...
Double-Move Chess: Similar to Marseillais chess, but with no en passant, check, or checkmate. The objective is to capture the king. By Fred Galvin (1957). [42] Double-Take Chess: Each player, once per game, can make two moves during one of their turns. These two moves cannot be used to place the opponent's king in checkmate.
A knight's tour is a sequence of moves of a knight on a chessboard such that the knight visits every square exactly once. If the knight ends on a square that is one knight's move from the beginning square (so that it could tour the board again immediately, following the same path), the tour is closed (or re-entrant); otherwise, it is open. [ 1 ...
Algebraic notation is the standard method for recording and describing the moves in a game of chess. It is based on a system of coordinates to uniquely identify each square on the board. [ 1 ] It is now almost universally used by books, magazines, newspapers and software, and is the only form of notation recognized by FIDE, the international ...
Chess notation systems are used to record either the moves made or the position of the pieces in a game of chess. Chess notation is used in chess literature, and by players keeping a record of an ongoing game. The earliest systems of notation used lengthy narratives to describe each move; these gradually evolved into more compact notation ...
Castling is the only move in chess in which two pieces are moved at once. [ 3] Castling with the king's rook is called kingside castling, and castling with the queen's rook is called queenside castling. In both algebraic and descriptive notations, castling kingside is written as 0-0 and castling queenside as 0-0-0.
A similar problem asks if a wazir starting at a corner square of an ordinary chessboard can visit every square exactly once, and finish at the opposite corner square. The wazir is a fairy chess piece that can move only one square vertically or horizontally (not diagonally). Using similar reasoning to the mutilated chessboard problem's classic ...
The only move that maintains the current evaluation of the position: If the position is theoretically drawn, this is the only move that does not lose; if the position is theoretically won, this is the only move that secures the win. An "!" is used no matter how trivial the move in question; the only exception is if it is the only legal move. !!