When a player makes an illegal move in chess, 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 mor