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==Formation== | ==Formation== | ||
While the hand shows a complete 1-9 grouping from a particular suit, it is best to view the long cluster as three separate groups of: 123, 456, and 789 | While the hand shows a complete 1-9 grouping from a particular suit, it is best to view the long cluster as three separate groups of: 123, 456, and 789. | ||
===Counter example=== | ===Counter example=== | ||
Having all the tiles from 1-9 in one suit is not sufficient to compose this yaku - they must form as sequences of 123, 456, 789. | |||
{{#mjt:12344m56p}} {{#mjt:5'677'89m}} Waiting for: {{#mjt:4p}} or {{#mjt:7p}} | {{#mjt:12344m56p}} {{#mjt:5'677'89m}} Waiting for: {{#mjt:4p}} or {{#mjt:7p}} | ||
In this counter example, the tiles 1-9 for one suit are in the hand | In this counter example, the tiles 1-9 for one suit are in the hand, but ittsuu would not be counted. Instead, they are grouped as 123, 567, and 789, with 4-man functioning as the [[Jantou|pair]]. | ||
==Discard characteristics== | ==Discard characteristics== | ||
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{{Yaku compatibility table|ITT}} | {{Yaku compatibility table|ITT}} | ||
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. | |||
=== With 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. | |||
=== With pinfu === | === With pinfu === | ||
[[Pinfu]] requires a [[machi|wait pattern]] of | [[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. | ||
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. | |||
=== With honitsu and chinitsu === | === With honitsu and chinitsu === | ||
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. | |||
With closed hands, this combination produces some very powerful hands. With honitsu, the hand produces [[mangan]]; while it is [[baiman]] with chinitsu. | 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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