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Comment on Playing Arcade Mahjong at Home? Or is it just a Mirage?parent

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It helps if you think that there are only three kinds of hands:

- 25 fu hand (chiitoitsu) 16 / 32 / 64

- 30 fu hands: 10 / 20 / 39 / 58

- 40 fu hands (especially toitoi, but also some others with koutsu's) 13 / 26 / 52

As long as you don't have any kans (and you mostly shouldn't call those), the others are a rounding error.

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