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Ikkitsuukan: Difference between revisions
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''' | {{Infobox yaku | ||
|type = Yaku | |||
|kanji = 一通 or 一気通貫 | |||
|english = Straight | |||
|value = 2 han<br>1 han (open) | |||
|yakuSpeed = Fast | |||
|difficulty = Easy | |||
|yakuCombine = * [[Pinfu]] | |||
* [[Yakuhai]] | |||
* [[Iipeiko]] | |||
* [[Chinitsu]] | |||
|gameExample = * [http://tenhou.net/0/?log=2013010402gm-0009-7447-x1ba0b4910bee&tw=3&ts=7 Closed ittsuu] | |||
* [http://tenhou.net/0/?log=2014030918gm-0089-0000-22ae5fde&tw=2&ts=6 Ittsuu] as [[kazoe]] | |||
}} | |||
'''Ikkitsuukan''' {{kana|一気通貫}}, or '''ittsuu''' {{kana|一通}} for short, is a [[List of yaku|yaku]], defined as three distinct [[mentsu|tile groups]] containing 123, 456, 789 of one suit. Collectively, the three groups form a complete single suit straight of 1 through 9. Naturally, in English terms, this hand can also be noted as a "straight", similar to the poker hand of the same name. This hand may be played open or closed. When open, the hand [[Kuisagari|loses value]] of one han. | |||
==Tile diagram== | ==Tile diagram== | ||
| Line 5: | Line 19: | ||
===Open=== | ===Open=== | ||
{{#mjt: 222m46s55z}} {{#mjt: 1 | {{#mjt: 222m46s55z}} {{#mjt: 1'23s}} {{#mjt: 8'79s}} Winning tile: {{#mjt: 5s}} | ||
==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. | |||
===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}} | |||
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== | |||
Hands aiming for ittsu often lack a particular suit, as a good number of one suit is collected in the hand. | |||
== Compatibility == | |||
{{main|Yaku compatibility}} | |||
{{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 === | |||
[[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 === | ||
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. | |||
==External links== | ==External links== | ||
{{jpwiki|一気通貫}} | |||
[[Category: Yaku]] | [[Category: Yaku]] | ||
{{Navbox yaku}} | {{Navbox yaku}} | ||