In chess, if you say checkmate and your opponent isn't checkmated, do you lose? - Quora

In chess, if my opponent says 'checkmate', does that end his turn, or is he allowed to continue to still hold on to his piece? - Quora

When you know you can't win or get stalemate in chess, is it better for your rating to concede than keep going to the bitter end? - Quora

Why do people say that perfect play in chess leads to a draw between evenly matched opponents? - Quora

In chess, if you say checkmate and your opponent isn't checkmated, do you lose? - Quora

Is it okay to kill your opponent in chess when you're losing? - Quora

Can I checkmate if my king was already in check? - Quora

Is it mandatory to say “check” in chess? - Quora

Is there some kind of unwritten rule in chess that you don't move the king unless you have to? - Quora

Chess: What are the most effective techniques to force a stalemate? - Quora

Why is the final move after checkmate not played? - Quora

In chess, if opponents king is never moved out of original position, then opponent moves his rook into a check position on my king, giving my queen direct access to take his