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Back-rank checkmate

checkmate delivered by a rook or queen along a back rank in which the mated king is unable to move up the board because the king is blocked by friendly pieces (usually pawns) on the second rank

Pronunciation
/bæk - ræŋk ˈʧɛkˌmeɪt/
/bak - raŋk ˈʧɛkmeɪt/