Plural of checkmate; multiple situations in chess where a player's king is in check and cannot escape, ending the game.
From the singular 'checkmate', itself derived from Persian 'shah mat'. The plural form follows standard English pluralization conventions and is used in chess discussions and strategic contexts.
Checkmate positions are so mathematically predictable that computers can now instantly recognize them from any board position, yet humans took thousands of years to formalize all the rules.
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