grandmastern.
英 'ɡrænd'mɑːstə | 美
中文n. 大师；最高段的棋手
词根词源
grandmaster (n.)as a chess title, 1927, from grand (adj.) in the sense "chief, principal" + master (n.). Earlier (as two words) a title in Freemasonry (1724) and in military orders of knighthood (1550s).
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