Optional yaku
Optional yaku are additional yaku, which may be appended to the standard list according to specific house rules.
Optional yaku
[[Daichisei]]
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The seven pair variant to tsuuiisou. This may count as an independent yakuman pattern. Otherwise, it may be counted as tsuuiisou. | |
       Agari:
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| [[Daisharin (pinzu) Daichikurin (souzu) Daisuurin (manzu)]]
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Any hand that follows this pattern: 22334455667788. The pattern for each suit takes on a different name. | |
       Agari:
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Iishoku sanjun
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Three identical sequences in one suit. | |
    Agari: or
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Iishoku yonjun
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Four identical sequences in one suit. | |
   Agari:
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[[Open riichi]]
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Riichi called where the hand or the tile waits are revealed. | |
Paarenchan
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If the dealer wins a hand with eight honba on the table, the hand is scored for yakuman regardless of its usual value, and then the dealership rotates. Usually, paarenchan is not a true yaku and the dealer must still have another yaku to declare a win, but this is not always the case. The exact counting of wins may also vary; some rules may award the yakuman on the eighth win, rather than the ninth, and some rules may require the dealer to actually accumulate that many wins, not just any honba. | |
[[Renhou]]
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A non-dealer player wins on a discard at the first round. | |
Sanrenkou
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Three consecutive triplets in one suit. | |
  Agari:  or
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Suurenkou
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Four consecutive triplets in one suit. | |
   Agari:
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Shiisanpuutaa
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A player is dealt a hand, by which, no two tiles can reasonably form a tile group with a tile draw. For completion, one tile may be paired. | |
   Agari:
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Shiisuupuutaa
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A player is dealt a hand, by which, no two tiles can reasonably form a tile group with a tile draw. For completion, no tiles are paired. | |
   Agari:
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Suurenkou
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Four consecutive triplets in one suit. | |
   Agari:
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