Rules of chess

Castling is a move in chess. It consists of moving the king two squares toward a rook on the same and then moving the rook to the square that the king passed over. Castling is permitted only if neither the king nor the rook has previously moved; the squares between the king and the rook are vacant; and the king does not leave, cross over, or finish on a square attacked by an enemy piece. Castling is the only move in chess in which two pieces are moved at once.

right|thumb|upright=1.35|White and Black in chess|Black is checkmated and loses the game.

special move in chess where, immediately after a pawn makes a 2-step move, if it could have been captured by an opposing pawn had it advanced only 1 step, then the opponent can capture the just-moved pawn “as it passes” through the 1st square

Stalemate is a situation in chess where the player whose turn it is to move is not in check but 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 the result 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.

rules of play for the game of chess

chess condition

in chess, the mandatory immediate replacement of a pawn reaching its 8th rank by the player's choice of a queen, knight, rook, or bishop of the same color

result of a chess game ending in a tie

situation in the game of chess

chess rule that a player can claim a draw if no capture has been made and no pawn has been moved in the last 50 moves

Mechanism used in chess

concept in chess

in chess and some other abstract strategy games, the rule that a player can claim a draw if the same position occurs three times, with the same player to move

chess rule that, if a player deliberately touches a piece on their turn, then they must move (if own) or capture (if opponent’s) that piece if legal; if a player wishes to adjust a piece, they must announce “j’adoube” or similar

in board games, mechanism to suspend a game, so it can be continued at another time

unfair behavior in chess

chess convention of colors used to indicate the first- and second-moving players

systems to break ties between players with the same number of points in chess Swiss system tournaments

chess game outcome when one player accepts the other's offer to draw