Checkmate
Checkmate was the winning position in chess. In this situation, the opponent's  was under attack with no means of escape.

In 2265, during a chess game, with James T. Kirks next move, Spock would be in position to checkmate Kirk's king. However, Kirk did a move which saved his king. ()

In 2266, when giving a recommendation to James T. Kirk about their situation of being caught in a tractor beam and facing destruction from the Fesarius, Spock said, "In chess, when one is outmatched, the game is over. Checkmate." ()

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