In chess, if you say checkmate and your opponent isn't checkmated, do you lose? - Quora
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Check, Checkmate, & Stalemate Differences Explained (with GIFs)
What is meant when some says 'checkmate'? - Quora
Can a king take a king in chess?
What's the easiest way to win chess in as few moves as possible? - Quora
Is it possible to checkmate with a king and a pawn in chess? - Quora
What happens if you accidentally put yourself in checkmate?
How do chess players analyze a position for tactics or strategy? - Quora
In chess, if you say checkmate and your opponent isn't checkmated, do you lose? - Quora
Force Your Opponent to Checkmate YOU
GQ does chessboxing, British GQ