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The FIDE Laws Of Chess. The official rules of Chess from the World Chess Federation.[All Comments] [Add Comment or Rating]

🕸Fergus Duniho wrote on Thu, Dec 18, 2003 06:22 PM UTC:

Levi,

You are right. Your opponent is wrong. Declaring check is nothing but an
expected courtesy. Whether or not you declare check has no bearing on what
moves are subsequently legal or illegal for your opponent. Whenever you
are in check, whether or not it has been declared, you must move out of
check if you can. If you can't, then you lose -- even when you opponent
has not noticed or declared it. If you stay in check during your move,
that move was illegal and must be taken back.