it is checkmate (for sb)
多用于棋局，也可引申指某人已无退路、注定失败。
With the king cornered and no square left to move to, it is checkmate.
国王被逼到角落、无路可走，这就是将死。
将死
checkmates — plural of checkmate
彻底失败；绝境；击破；彻底失败
In chess, a move that puts the opponent's king in check from which it cannot escape, ending the game in victory.
The conclusive victory in a game of chess that occurs when an opponent's king is threatened with unavoidable capture.
Any losing situation with no escape; utter defeat.
The game ended in a brilliant checkmate by the black queen.
比赛以黑方女王的一次精彩将死结束。
用法提示：这里'checkmate'作为名词，表示象棋中将军并杀死对方国王的一步。
After years of negotiations, the treaty was seen as a checkmate for the opposition.
经过多年的谈判，该条约被视为对反对派的彻底胜利。
用法提示：这里'checkmate'作为名词，比喻完全的胜利或击败。
He planned his strategy carefully, aiming for a decisive checkmate in the final round.
他精心策划策略，旨在最后一轮取得决定性的将死。
用法提示：这里'checkmate'作为名词，指代象棋中的制胜一步或比喻中的决定性胜利。
多用于棋局，也可引申指某人已无退路、注定失败。
With the king cornered and no square left to move to, it is checkmate.
国王被逼到角落、无路可走，这就是将死。
force 后直接接 checkmate，说明用多少步逼出将死的结局。
White forced checkmate in just four moves.
白方仅用四步就逼成了将死。
deliver checkmate 强调走出致命的一步，比笼统说 win 更具体。
She delivered checkmate with her queen on the last move.
她最后一步用后完成了将死。
grammar · medium
易错句子He missed two easy checkmate in the endgame.
正确表达He missed two easy checkmates in the endgame.
checkmate 是可数名词，前面有数词 two 时要用复数形式 checkmates；汉语名词没有复数词尾，容易漏掉 -s。
grammar · medium
易错句子My king is checkmate, so the game is over.
正确表达My king is in checkmate, so the game is over.
checkmate 是名词，不能像形容词那样直接作表语；表示“处于被将死状态”要用介词短语 in checkmate。
checkmate 是将死：王被将军且无法脱身，一方获胜；stalemate 是轮走一方无合法着法而王未被将军，判和棋。引申义上，stalemate 指僵局，checkmate 指无路可退的彻底失败。
check 是直接攻击对方的王，对方必须应将，棋局继续；checkmate 才是对方无法应将的终局。中文里“将军”并不等于“将死”。
defeat 泛指比赛、战争、选举等中的失败，不限于象棋；checkmate 本义是象棋的将死，作引申义时强调“无路可退”，多见于比喻性表达。
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