Toitoihou

Toitoi 「対々」 is a standard yaku. In English, it is referred as "all triplets". That's due in part with every meld be composed of triplets. This yaku is not affected by kuisagari, where the hand is devalued in terms of han while open.

Toitoihou
Type Yaku
Kanji 対々
English All triplets
Value 2 han
Speed Medium
Difficulty Easy

Tile pattern

               Agari:   or  

Closed toi toi

              Agari:   or  

If this hand wins by tsumo, then it counts for the suuankou yakuman. Otherwise, it's a toi toi mixed with sanankou.

Formation

As the name implies, this yaku requires koutsu. Usually, this yaku is called open due to the ability for pon to claim discarded tiles from any player.

Compatability

^ Ippatsu requires riichi to be of any use.

RCH DRI IPP^ SMO TAN PFU IPK ITT YAK SDJ SDO TOI SNA SNK CHA JUN RPK SSG HRO HON CHN CHI RIN HAI HOU CHK
TOI                                                  

Toitoi with mentsumo and junchan actually form yakuman, as suuankou and chinroutou respectively. Toitoi with chanta forms honroutou.

Viability

External links

Toitoihou in Japanese Wikipedia