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在此情形之下，黑下a或b点的时候，如白棋未作出回应黑棋再落一子即可提白子。也就是说黑棋于a或b落子为叫吃的状态。
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下一步黑棋下在a点可提取中央的白子。白子逃出的唯一途径是于a点连起。
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以上各式情形只要白棋被黑下于a点便可被提子。
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在两处同时叫吃的状态为双叫吃。
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在上图中，白1可同时叫吃两黑子，黑棋只能逃出其中一子。
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