The present participle form meaning the ongoing process of putting an opponent's king in checkmate, or figuratively, the act of completely defeating someone.
From 'checkmate' with the progressive suffix '-ing'. In chess terminology, this gerund form describes the action of achieving checkmate during gameplay.
In chess strategy, 'checkmating' patterns are so important that grandmasters memorize thousands of them—certain positions reliably lead to checkmate in predictable numbers of moves.
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