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Jyutping wu1 zi2 zai2
Pinyin wū zi zǎi

Definitions (Wiktionary)
  1. noun, Xiamen, Zhangzhou-Hokkien
    black piece in the board game go
    (syn.) 烏子, 烏子仔, 黑子兒, 烏子 GT, 黑子子, GT - General Taiwaneseno specific region identified), 黑子, 黑棋