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| {{Yaku compatibility table|ITT}} | | {{Yaku compatibility table|ITT}} |
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| This yaku only leaves room for one tile group of any type, such as a triplet. Therefore, any yaku that requires more than one triplet, including [[sanshoku doukou]], [[toitoi]], [[sanankou]], [[sankantsu]], and [[shousangen]], is deemed incompatible. [[Chiitoitsu]] is likewise incompatible as it does not use [[mentsu]]. [[Tanyao]], [[chanta]], [[junchan]], and [[honroutou]] are incompatible as the 456 group contains no terminals or honours, but the 123 and 789 groups contain terminals. Finally, ittsuu is incompatible with [[sanshoku doujun]] and [[ryanpeikou]] as they each require at least three sequences in a way that are incompatible with the sequences used for ittsuu.
| | Ittsu requires three groups to be sequences, leaving room for only one other tile group. Yaku that require more than one triplet - [[sanshoku doukou]], [[sanankou]], [[sankantsu]], [[shousangen]], [[toitoi]] - are thus incompatible. Similarly, [[sanshoku]] and [[ryanpeikou]] are incompatible because there is no room for their patterns. [[Chiitoitsu]], which does not use [[mentsu]], is likewise incompatible. The 456 sequence invalidates [[chanta]], [[junchan]], and [[honroutou]], while the 123 and 789 sequences invalidate [[tanyao]]. |
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| === With sanshoku === | | Ittsu can often be combined with [[honitsu]]/[[chinitsu]], as the ittsu is already composed of 9 tiles of the same suit. [[Pinfu]] also combines well; however, if the ittsu section is not complete, the hand would be subject to to [[takame and yasume]] (only one of two waiting tiles would score this yaku). |
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| | === Vs sanshoku === |
| {{main|Ittsu vs sanshoku}} | | {{main|Ittsu vs sanshoku}} |
| Ittsuu requires three out of the four tile groups to be composed of sequences: 123, 456, and 789. Sanshoku also requires at least three groups of sequences. Sometimes, a hand may be 1-shanten from either yaku because of composition. There comes a point where a player may need to choose one yaku over the other, depending on the circumstances. | | Ittsuu requires three out of the four tile groups to be composed of sequences: 123, 456, and 789. Sanshoku also requires at least three groups of sequences. Sometimes, a hand may be 1-shanten for both yaku because of composition, forcing players to decide one or the other. |
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| === With pinfu ===
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| [[Pinfu]] requires a [[machi|wait pattern]] consisting of [[ryanmen]] (open wait) or a related wait like [[ryanmenten]] (three sided open). If a hand is waiting to complete the 1-9 pattern, a ryanmen wait would be subject to [[takame and yasume]]: only one tile would complete the ittsu.
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| However, this problem is completely averted if the hand already contains the full 1-9 pattern, with a wait depending on the extra tile group.
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| === With honitsu and chinitsu ===
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| Ittsuu already contains nine tiles (1-9) of a single suit, so [[honitsu]] and [[chinitsu]] naturally combine with ittsuu. To form those yaku, the remaining four tiles (plus one winning tile) have to be composed of the same suit or an honor tile.
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| With closed hands, this combination produces some very powerful hands. With honitsu, the hand produces [[mangan]]; while it is [[baiman]] with chinitsu.
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| ==External links== | | ==External links== |