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.

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

Tile pattern

               Agari:   or  

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.

External links

Toitoihou in Japanese Wikipedia