What are the rules about when your king is found to be in check from several moves back, but it wasn't called, and play had continued?
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M$4 Answers
"If during a game it is found that an illegal move, including failing to meet the requirements of the promotion of a pawn or capturing the opponent’s king, has been completed, the position immediately before the irregularity shall be reinstated."
There's no more specific reference to overlooking a king being in check, so the rule for illegal moves applies. (The illegal move being whatever was played instead of getting out of check.)
http://www.fide.com/fide/handbook?id=124&view=article (see sec 7.4)
That's what would happen in serious competition, if let's say things got muddled up in a time scramble.
If it's just a game between friends and you haven't been recording the moves, you can probably agree between yourselves what to do.
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M$
If your charitable, you could excuse him for missing it, but chess is a blood thirsty game right?
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M$
'chess is a blood thirsty game right?' :)
Calling out "check" is not actually a rule. It's more like a polite custom. And apparently it's not normally done in high-level games, where presumably it might even be a little bit insulting to suggest that the opponent needs to told!
http://en.wikipedia.org/wiki/Check_(chess)#Notation_and_announcing_check
While checking the facts, OMG, I found a really good Q&A site!
http://en.allexperts.com/q/Chess-1332/
Now, let's say that you COMPLETE a move of a piece OTHER than your King, then you both realize that YOUR king is in check, your opponent must move his piece either along the same attack vector (straight line or diagonal line - the Knight would not be able to accomplish this) or may remove his piece from check OR may move another piece trapping your King, thus checkmate, UNLESS you have an escape, then you escape. However, IF your opponent has no where to go but in a direction to TAKE your King, he cannot (you cannot actually remove the king off the board, you cannot actually capture it like all other pieces), he MUST move another piece at his turn. You really should not do a "do-over" unless, as others here suggest, it is just for fun and NOT competition.
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M$
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
As I said, if it's a friendly game, you should just agree between yourselves what to do. If one person was obviously winning, it would be decent of the other to resign. Otherwise just pack it in, and start a new game.
If you have somehow got in that situation in a serious game, there will be an arbiter who'll make a decision on what happens.
This answer should be commended for actually looking up the rules. The other answers just guessed, and guessed wrong at that.
If you read the rest of the source it says that if you can't remember all the way back to the offending move you go back as far as you can remember.
The problem is that neither of us remember the sequence of moves, and then all of the sudden, when I went to move, I saw that my opponent was already in check.