Multiple yakuman
Multiple yakuman involve hands with more than one yakuman, as the name implies. While regular yaku may be stacked in one hand to raise value, the same can be done with different yakuman, where applicable.
In terms of scoring, the number of yakuman in the hand serves as a multiplier to the base yakuman point value. As a result, extremely high scoring hands are made possible.
If, in addition to one or more regular yakuman, the hand would also be a kazoe yakuman, no extra yakuman is added for this. For regular yakuman, han from normal yaku and dora are not counted.
Scoring
Application of the multiple yakuman may vary, as some rules do not allow multiple yakuman in terms of scoring. This is largely due to the extremely high value applied by multiple yakuman. In this case, even if the hand is composed of multiple yakuman, the score payout may be capped.
Single yakuman cap
Many professional organizations in Japan limit all payouts to a single yakuman, being 32,000 point for nondealer and 48,000 points for the dealer. This means that there are no double yakuman, and yakuman are not cumulative.
Cumulative single yakuman
Some groups, most notably Tenhou.net, do not award double yakuman for any specific hand. However, multiple yakuman are still possible, if two (or more) different yakuman are completed in the same hand. Most commonly, this involves tsuuiisou alongside either shousuushi or daisangen. Other combinations are possible, but they are very rare.
Full scoring
Under full scoring rules, four yakuman patterns may produce specific instances, that are worth double yakuman. Under this ruleset, the combination of yakuman are applied. In addition, particularly rare and difficult hands are worth double the score value of a normal yakuman by themselves.
- Daisuushi is more difficult to complete than the lesser hand shousuushi. So, daisuushi is worth double.
- Kokushi musou is double yakuman when completed on a 13-sided wait.
- Chuuren poutou is double yakuman when completed on a 9-sided wait.
- Suuankou is double yakuman when completed on a tanki wait. This is also the only way that the hand can win by ron.
If the optional yaku daichisei is being used, since it is necessarily a special case of the single yakuman tsuuiisou, this is another case where a single yakuman can be upgraded to double yakuman.
Example value differences based on applied rules
Agari:
* Single yakuman cap: 1 yakuman. * Cumulative single yakuman: 1 yakuman. * Full scoring: 2 yakuman.
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Agari:
* Single yakuman cap: 1 yakuman. * Cumulative single yakuman: 2 yakuman. * Full scoring: 2 yakuman.
Tsumo:
* Single yakuman cap: 1 yakuman. * Cumulative single yakuman: 2 yakuman. * Full scoring: 2 yakuman.
- Agari:
* Single yakuman cap: 1 yakuman. * Cumulative single yakuman: 3 yakuman. * Full scoring: 4 yakuman.
Game examples
- 【麻雀】福光聖雄の小四喜・字一色！！ (YouTube)
- Shousuushi with tsuuiisou, using single yakuman cap.