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Toitoihou: Difference between revisions
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|gameExample = * [http://tenhou.net/0/?log=2014080608gm-0089-0000-c7c0bd29&tw=0&ts=8 Toitoi] with [[sanshoku doukou]] | |gameExample = * [http://tenhou.net/0/?log=2014080608gm-0089-0000-c7c0bd29&tw=0&ts=8 Toitoi] with [[sanshoku doukou]] | ||
}} | }} | ||
'''Toitoihou''' {{kana|対々和}}, often shortened to '''toitoi''' {{kana|対々}} is a standard yaku. | '''Toitoihou''' {{kana|対々和}}, often shortened to '''toitoi''' {{kana|対々}} is a standard yaku. Known as "All Triplets" in English, toitoi requires all four [[mentsu|tile groups]] to be either triplets or [[kan|quads]]. | ||
==Tile pattern== | ==Tile pattern== | ||
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===Closed toitoi=== | ===Closed toitoi=== | ||
:{{#mjt:444z333p666s77m66z}} | :{{#mjt:444z333p666s77m66z}} Ron: {{#mjt:7m}} or {{#mjt:6z}} | ||
If this hand wins by [[Menzenchin tsumohou|tsumo]], then it counts for the [[suuankou]] yakuman. | If this hand wins by [[Menzenchin tsumohou|tsumo]], then it counts for the [[suuankou]] yakuman. Otherwise, it's a toitoi mixed with [[sanankou]]. | ||
==Formation== | ==Formation== | ||
As the name implies, this yaku requires [[Mentsu#Koutsu|koutsu]]. | As the name implies, this yaku requires [[Mentsu#Koutsu|koutsu]]. Usually, this yaku is called open due to the ability for [[pon]] to claim discarded tiles from any player, giving this yaku the nickname of "[[pon]] palace". This yaku does not reduce in value once opened. | ||
=== Viability === | |||
Naturally, this yaku is reasonable if your hand contains many triplets and/or pairs. Note that toitoi looks easier than it actually is. While you have access to pon to complete triplets, your opponents might not discard the tiles that allow you to pon in the first place. This is especially true with middle tile pairs (pairs made of tiles from 3-7); since the middle tiles are likely to be kept in an opponent's hand, they are hard to pon, making this yaku slow to complete. | |||
In addition, a hand with many pairs can also form [[chiitoitsu]]. The (very rough) rules of thumb are: | |||
*If you have 4 pairs and one turns into a triplet, you should probably go for a regular hand structure. This may or may not be toitoi. | |||
*If you have 5 pairs, you should likely go for chiitoitsu. Keeping the option for toitoi is fine (e.g. 4 pairs, 1 triplet, 2 lone tiles) so long as the pairs are available to pon. | |||
*If one of the pairs cannot be turned into a triplet, because both remaining tiles of the pair are [[Kabe#Visible TIles|visible]]), then favor chiitoitsu. | |||
=== Compatibility === | === Compatibility === | ||
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{{Yaku compatibility table|TOI}} | {{Yaku compatibility table|TOI}} | ||
Toitoi is incompatible with any yaku requiring a sequence, meaning [[pinfu]], [[iipeikou]], [[ittsu]], [[sanshoku doujun]], [[ryanpeikou]], and [[chankan]] (since it can only win on a sequence wait). It also cannot be combined with [[chiitoitsu]], since it doesn't use [[mentsu]]. | Toitoi is incompatible with any yaku requiring a sequence, meaning [[pinfu]], [[iipeikou]], [[ittsu]], [[sanshoku doujun]], [[ryanpeikou]], and [[chankan]] (since it can only win on a sequence wait). It also cannot be combined with [[chiitoitsu]], since it doesn't use [[mentsu]]. | ||
Toitoi with [[mentsumo]] and [[junchan]] actually form yakuman, as [[suuankou]] and [[chinroutou]] respectively. Toitoi with [[chanta]] forms [[honroutou]] instead. | |||
==External links== | ==External links== | ||