Especially in blitz or bullet games, it is possible that a player makes an illegal move, for example castles through check.

  • If the opponent does notice the illegal move, then as far as I know the first player is obliged to make a legal move with the same piece, if one exists. What if there are no legal moves?

  • What if the opponent, being in time pressure, doesn't notice the illegal move and makes a move. What happens after they realize that? Does the person who made the illegal move forfeit? Or is the whole game cancelled?

Are there any standard rules for these kinds of situations?


This only really applies to over the board games (since online chess servers prevent illegal moves).

In a standard time control game, under USCF rules, when the illegal move is noticed by one of the players, a few things happen. First, the illegal move must have been made within the last 10 moves. If not, then the current position stands, and play continues. Assuming that the move is recent, the position is restored to the position immediately before the illegal move.

Then, the player that made the illegal move now must make a legal move with the same piece (if one exists). If there are no legal moves, then the player is free to make any move. This is due to the touch move rule. Finally, if the offending player has pressed the clock, a two minute "bonus" is added to the opponent's clock to compensate them for any time lost and to penalize the offending player.

Here is the relevant passage from the USCF rulebook:

11A. Illegal move during last ten moves. If, during a game, it is found that one of either player's last ten moves was illegal, the position shall be reinstated to what it was before the illegal move. The game shall then continue by applying Rule 10, The Touched Piece, to the move replacing the illegal move. If the position cannot be reinstanted, then the illegal move shall stand. Move counters on clocks that have them may by readjusted.

11D. Illegal move. If, a player completes an illegal move by pressing the clock, in addition to the usual obligation to make a legal move with the touched piece if possible, the standard penalty specified in rule 1C2a applies (i.e. two minutes added to the opponent's clock).

In blitz chess, the rules are different. According to the WBCA (World Blitz Chess Association) rules, a player who makes an illegal move loses the game instantly. This rule is frequently enforced in casual games too. The most common way that this occurs is that one player doesn't notice that they are in check and makes a move that doesn't get out of check. Then the checking player simply captures the king and claims a victory.

Because blitz is a much faster pace game, the illegal move must be noticed within two moves. If it is not, then the current position stands and play continues.

At no point is the game cancelled due to an illegal move. Pretty much once a game starts and both players make a move, a result of win, loss, or draw will be recorded.

  • 3
    Note that these are the USCF rules, used in the US. The FIDE rules used everywhere else are slightly different. – RemcoGerlich Jul 8 '13 at 12:39
  • @RemcoGerlich agreed, the differences mainly apply to adjusting the clocks. The answer by blunders quotes the FIDE rules. – Andrew Jul 8 '13 at 13:52
  • 4
    Under FIDE rules, there is no 10 move limit after which an illegal move stands. And if the position before the illegal move can't be reconstructed, USCF continues with the current position, but FIDE continues with the last known position before the illegal move -- which may be the starting position. Capturing the king in blitz counts as an illegal move itself under FIDE rules, and the opponent can claim a win if you try to claim a win using that. There's also a distinction between classical and rapid chess, in rapid the players must claim but in classical the arbiter can act on his own. – RemcoGerlich Jul 8 '13 at 17:15
  • Also known as, I should write an answer myself. I may have some time later... – RemcoGerlich Jul 8 '13 at 17:16
  • That would be an awesome answer, preemptive +1 from me... One interesting note about USCF rules your comment reminded me of - an arbiter (TD in USCF parlance) is allowed but not required to point out an illegal move when time pressure is not in effect. – Andrew Jul 8 '13 at 17:39

A player who makes an illegal move must retract that move and make a legal move. That move must be made with the same piece if possible, because the touch-move rule applies. If the illegal move was an attempt to castle, the touch-move rule applies to the king but not to the rook. The arbiter should adjust the time on the clock according to the best evidence. If the mistake is only noticed later on, the game should be restarted from the position in which the error occurred (Schiller 2003:24–25). Some regional organizations have different rules.

If blitz chess is being played (in which both players have a small, limited time, e.g. five minutes) the rule varies. A player may correct an illegal move if the player has not pressed their clock. If a player has pressed their clock, the opponent may claim a win if he or she hasn't moved. If the opponent moves, the illegal move is accepted and without penalty (Schiller 2003:77).

SOURCE: Rules of Chess, Illegal move

protected by Glorfindel Dec 30 '17 at 21:33

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