Old books write the game of go with this character; today it is written 棋.
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碁 is an old variant of 棋 ('a board game; chess; go') and is not used in standard modern Chinese, where 棋 is standard (围棋 'go', 象棋 'Chinese chess'). Japanese still uses 碁 for the game of go (igo, 囲碁).
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Old variant — classical Chinese text, Japanese go terminology, and variant-form notes; modern Chinese uses 棋.
