Ryuuiisou
| Type | Yakuman |
|---|---|
| Kanji | 緑一色 |
| English | All green |
| Value | Yakuman |
| Speed | Very slow |
| Difficulty | Very hard |
Ryuuiisou (緑一色) is one of the standard yakuman hands. This hand consists of any four melds and a pair that consists of only 2, 3, 4, 6, 8 of souzu and/or the green dragon tiles. Literally, this hand is composed of "all green" painted tiles. This hand may be open or closed.
Some rules require hatsu (green dragon) in the hand, among them JPML A. The Tenhou.net rules and the EMA rules allow ryuuiisou with and without hatsu. This is the more common rule.
Even though all paint on the haku (white dragon, has no painting at all) is green, it doesn't count as a green tile.
Tile diagram
Winning tile: or
Open
Winning tile: or
This example is only possible under the common ruling of optional hatsu.
Value
This hand is a yakuman hand which automatically awards 32000 points to a non-dealer winner, or 48000 points to a dealer winner.
Formation
This yakuman is literally all green, as all the tiles are composed of green tiles. No markings of other color are applied to these tiles, hence its designation as all green. With this yakuman, only six tile types are available:
With the four melds and a pair pattern, at least, five out of the six tile types are needed to complete this yakuman. It is possible to use all six tile types, when 2-3-4 were used as shuntsu. Yet, it is impossible to form a chii toitsu type pattern.
Furiten
Waiting for: 
- or
This hand may regularly be subject to furiten, especially around the range of 1, 2, 3, 4, and 5 sou. While it is necessary to discard 1 sou and 5 sou to build this yakuman, these discarded tiles may lead to a tenpai hand with furiten. That may be particularly true for above example.
External links
- Ryuuiisou in Japanese Wikipedia
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