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A check is the result of a move that places the opposing king under an immediate threat of capture by one (or occasionally two) of the player's pieces. Making a move that checks is sometimes called "giving check". Even if a piece is pinned against the player's own king, it may still give check. For example, in the diagrammed position, White has ...
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.
An illegal move [65] is a move not made according to a piece's possible defined movements [66] or made according to its possible movements but such that its own king is left or placed in check. [16] Furthermore, pressing the clock without making a move or making a move with two hands is considered and penalized as an illegal move.
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A four-piece tablebase must rely on three-piece tablebases that could result if one piece is captured. Similarly, a tablebase containing a pawn must be able to rely on other tablebases that deal with the new set of material after pawn promotion to a queen or other piece. The retrograde analysis program must account for the possibility of a ...
The mann is one of the most simply described chess pieces and as such has a long history and has gone by many names. [a] A similar piece known as the dabbaba was described c. 950 in a form of chess on a 10×10 board. [2] The mann is used in Courier chess, invented in the 12th century and commonly played until the 18th century. [5]
In chess, the "touch-move" rule states that if a player (whose turn it is to move) touches one of their pieces, it must be moved if it has a legal move. In addition, if a piece is picked up and released on another square, the move must stand if it is a legal move. If an opponent's piece is touched, it must be captured if it is legal to do so.