The term "checkmate" is commonly used in the game of chess. It signifies a position in which a player's king is placed under immediate threat of capture (in "check") and there are no legal moves available to escape the threat. Achieving checkmate means that the game is over, and the player delivering it wins. This term highlights the strategic depth and mental challenge inherent in chess, a game played globally across various levels of expertise, from casual games to world championships.