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Yaku compatibility: Difference between revisions
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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. 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 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. | ||
:There are two partial exceptions to this rule: | |||
:*[[Shousangen]] always implies two dragon yakuhai, but does not guarantee you have any one of "haku", "hatsu", or "chun". | |||
:*[[Ippatsu]] must be scored with a hand that declares [[riichi]]. However, "riichi" and "[[double riichi]]" are considered as 2 distinct yaku. Therefore, an ippatsu hand does not guarantee "riichi", since it could also be "double riichi". | |||
When two yaku imply each other, as with reason #2, there are two alternate ways to define it in the rules: | 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, | *"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, and in addition, 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. | *"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. Junchan is worth more, so it supersedes chanta. | ||
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. | 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. | ||