When a player makes an illegal move in , he or she must withdraw it and make a valid move. If possible, this move must be made with the same piece, as the touch-move rule applies. If the unlawful move was an attempt to castle, the king is subject to the touch-move rule, but the rook is not. The arbitrator should change the clock to reflect the best evidence. If the issue is discovered later in the game, the game should be restarted from the point at which the fault occurred. Certain regional groups have their own set of rules.
When blitz chess is played (in which both players have a limited amount of time, for example, five minutes), the rule changes. If a player has not punched their clock, they may correct an illegal move. If a player presses the clock, his or her opponent may claim victory if the player does not move. If the opponent moves, the illegal manoeuvre is accepted unpunished.
According to FIDE's Chess Laws, the first completed unlawful move results in the opponent receiving two more minutes on the clock. The second completed illegal move by the same player results in the loss of the game unless the opponent's position makes any succession of legal movements impossible (for example, if the opponent has a bare king), in which case the game is drawn. A move is considered complete after it is made and the player presses the clock. In quick and blitz chess, the first unlawful move performed results in a loss.
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