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In lightning chess matches (matches with time controls of 3 minutes or less on each side), some players play with the rule of "king sniping" - that is, to save time, if the opponent played a move that left his king in check, the other player can simply capture it (thereby winning the game) rather than forcing the opponent to retract his move.

Combined with the rule that the king cannot castle through check (cannot move two spaces if the space between the origin and destination is attacked by an opposing piece), the problem arises of what the appropriate way is to capture the king if this actually happens in a lightning match, as the king is not in a position of check either before or after the opponent's turn. Simply taking the king away might confuse the player because the other piece will have made a technically illegal move, but moving to the square that the king castled through (which amounts to a sort of "en passant" capture, capturing a piece/pawn that moved two squares in a special case as if it had only moved one square) captures the rook instead of the king.

Is there any convention for this?

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Or, if you're a ninja, flick the piece they're casting through at the perfect instant to knock the king out of your opponent's hand as it's passing through the covered square. –  Cameron Fredman Apr 7 at 16:37
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2 Answers

When the king castled through check, your opponent made an illegal move. Call it, and you win.

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en.wikipedia.org/wiki/Fast_chess - "A common rule used in fast chess tournaments is that if a player makes an illegal move, the player's opponent may point it out and claim a win." –  Tom77 Jul 29 '13 at 9:11
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I'd say the en passant method is the way to go. There's no conventions for this that I know of.

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Probably because it happens so rarely, I bet. –  Joe Z. Mar 6 '13 at 2:14
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