A yaku is a scoring condition in Japanese riichi. Without one you cannot win, even if the shape is four sets and a pair. Riichi itself is a yaku. American mahjong does not use this word; it reads a printed line.
Yaku
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A yaku is a scoring condition in Japanese riichi. Without one you cannot win, even if the shape is four sets and a pair. Riichi itself is a yaku. American mahjong does not use this word; it reads a printed line.