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# Conflicting definitions. [[Tanyao]] requires the hand contains no honor tiles, but [[yakuhai]] requires a triplet of honor tiles, so the two cannot be combined. | # Conflicting definitions. [[Tanyao]] requires the hand contains no honor tiles, but [[yakuhai]] requires a triplet of honor tiles, so the two cannot be combined. | ||
# When a yaku always implies another yaku, they cannot score together. For instance, a [[junchan]] hand has a terminal in every group. | # When a yaku always implies another yaku, they cannot score together. For instance, a [[junchan]] hand has a terminal in every group. Chanta requires that the hand has a terminal or honor in every group. Because every junchan hand would also qualify for chanta, chanta is not scored. | ||
When two yaku imply each other, as with reason #2, there are two alternate ways to define it in the rules: | |||
*"Alter the yaku definitions so that they can never be scored together". In these rules, chanta is scored when there are honors/terminals in each group, also, the hand ''must'' contain at least one honor tile. | |||
*"Yaku that imply each other cannot be scored". In these rules, chanta is scored when there are honor/terminals in each group (not requiring an honor tile). However, chanta and junchan are never scored together. | |||
Both definitions are equivalent for any practical case. Most of these combinations, with the exception of toitoi + mentsumo, are based on the assumption that the yaku are defined using the second method. | |||
===Indirectly illegal=== | |||
There are a few combinations that are indirectly impossible due to the implication rule. | |||
Four combinations actually form yakuman: | Four combinations actually form yakuman: | ||
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These combinations are marked with {{or}} in the table below. | These combinations are marked with {{or}} in the table below. | ||
== Yaku == | == Yaku == | ||
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{{main|Multiple yakuman}} | {{main|Multiple yakuman}} | ||
Yakuman may not combine with regular yaku. However, in certain rulesets, different yakuman can combine with each other. As a result, hands can score multiple yakuman. | |||
The maximum number of distinct yakuman a hand can have is four: [[suuankou]], [[tsuiisou]], [[daisuushii]], and one of [[tenhou]]/[[chiihou]]/[[suukantsu]]. In rulesets where suuankou tanki and daiisuushi are scored as double, the hand ends up with a sextuple (x6) yakuman. | |||
=== Compatibility === | === Compatibility === |
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