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Staunton style chess pieces. Left to right: king, rook, queen, pawn, knight, bishop. The rules of chess (also known as the laws of chess) govern the play of the game of chess. Chess is a two-player abstract strategy board game. Each player controls sixteen pieces of six types on a chessboard. Each type of piece moves in a distinct way.
The Légal Trap or Blackburne Trap (also known as Légal Pseudo-Sacrifice and Légal Mate) is a chess opening trap, characterized by a queen sacrifice followed by checkmate involving three minor pieces if Black accepts the sacrifice.
Zugzwang (from German 'compulsion to move'; pronounced [ˈtsuːktsvaŋ]) is a situation found in chess and other turn-based games wherein one player is put at a disadvantage because of their obligation to make a move; a player is said to be "in zugzwang" when any legal move will worsen their position.
The entire move must be completed with one hand. A player who attempts to castle illegally must return the king and rook to their original squares and then make a legal king move if possible (which may include castling on the other side). If there is no legal king move, the touch-move rule does not apply to the rook. [8] [9]
The en passant capture is the only capturing move in chess where the capturing piece moves to a square not occupied by the captured piece. [6]: 463 Because many casual players are unfamiliar with or misunderstand the en passant rule, administrators on internet chess sites frequently receive erroneous complaints of bugs, cheating or hacking. [7]
Chess openings are primarily categorized by move sequences. [19] In the initial position, White has twenty legal moves. [ 20 ] Of these, 1.e4, 1.d4, 1.Nf3, and 1.c4 are by far the most popular as these moves do the most to promote rapid development and control of the center.
The touch-move rule in chess specifies that a player, having the move, who deliberately touches a piece [a] on the board must move or capture that piece if it is legal to do so. If it is the player's piece that was touched, it must be moved if the piece has a legal move.
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. !!