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{{main|Yaku compatability}} | {{main|Yaku compatability}} | ||
{{ | {{Yaku compatibility table|ITT}} | ||
| ITT | |||
Ittsu requires three out of the four tile groups to be composed of sequences: 123, 456, and 789. That may only leave room for one tile group of any type, such as a triplet; and so, any yaku that requires more than one triplet is deemed incompatible. | Ittsu requires three out of the four tile groups to be composed of sequences: 123, 456, and 789. That may only leave room for one tile group of any type, such as a triplet; and so, 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]], and this disqualifies [[honroutou]] since honroutou requires either toitoi or chiitoi. [[Tanyao]], [[chanta]], and [[junchan]] are incompatible as the 456 group contains no terminals or honours, but the 123 and 789 groups contain terminals. Finally, Ittsu is incompatible with [[sanshoku dojun]] and [[ryanpeikou]] as they each require at least three sequences in a way that are incompatible with the sequences used for ittsu. | ||
=== With pinfu === | === With pinfu === |