Toitoi 「対々」 is a standard yaku. In English, it is referred as "all triplets"; and it also acquired the nickname of "pon palace". That's due in part with every tile group to be composed of triplets. With this in mind, this hand is immune to any requirement involving the numbered suits or honor tiles. Simply, any group of triplets would suffice. This yaku is not affected by kuisagari, where the hand is devalued in terms of han while open.
Closed toi toi
- Toitoihou in Japanese Wikipedia