check·mate 
/ˈtʃɛkˌmeɪt/ noun
plural check·mates /ˈtʃɛkˌmeɪt/ noun : a situation in chess in which a player loses the game because that player's king is in a position from which it cannot escape [noncount] ▪ a brilliant move that resulted in checkmate [count] ▪ The challenger can force a checkmate with his next move. — compare 2check 7, stalemate 2
— check·mate verb, check·mates; check·mat·ed; check·mat·ing [+ obj]
▪ The challenger checkmated the champion and won the tournament. ▪ His king was checkmated.
▪ The challenger checkmated the champion and won the tournament. ▪ His king was checkmated.
