Tsuuiisou

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Tsuuiisou 「字一色」 is a yakuman in which the hand consists entirely of honour tiles.

Tsuuiisou
Type Yakuman
Kanji 字一色
English All honors
Value Yakuman
Speed Very slow
Difficulty Very hard

Tile pattern

              Agari:   or  

Development

For this yakuman, all kazehai (wind tiles) and sangenpai (dragon tiles) can be used. Given the nature of jihai (honor tiles), they different types cannot be mixed into a meld. Therefore, they must be collected in the form of koutsu (triplets). This yakuman is only reasonably achievable, when in possession of at least multiple toitsu (pairs) of the honor tiles.

Daichisei

              Agari:  

A specific variant to tsuuiisou is possible and be considered as a separate yakuman, daichiisei 「大七星」. It is a variant of chiitoitsu (seven pairs). This variant uses two of the each honour tiles and is sometimes called a "Dai Chii Sei" or Big Seven Stars. There are exactly seven types of honor tiles, which makes this difficult pattern possible. As a consequence, this variation remains as a closed only hand. This is optionally worth double yakuman.

External links

Tsuuiisou in Japanese Wikipedia