Chiniisou
Chinitsu (清一色) is a standard yaku. This yaku is composed of tiles in one suit only. Chinitsu is worth 6 han, but it decreases to 5 han when opened.
| Type | Yaku |
|---|---|
| Kanji | 清一色 |
| English | Flush |
| Value |
6 han (closed) 5 han (open) |
| Speed | Slow |
| Difficulty | Medium |
Tile patterns
Using pinzu:
Agari: or
Using manzu:
Agari: 
or or or
Using souzu:
Agari: or or or or 
Formation
As defined, this yaku is formed by collecting tiles of one suit. Therefore, tiles not of a particular suit are regularly discarded. As a consequence, a player aiming for a chinitsu may be easily detected via discards alone.
Complex wait patterns
Chinitsu is notorious for developing complex wait patterns. This is due to the homogenous nature of the yaku. Often, the tiles may form long strings of consecutive numbers. Upon doing so, the wait patterns increase in complexity. Without the help of computers, determining the winning tiles upon tenpai may become somewhat of a task.
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 | |
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Chinitsu requires a single suit, so that deems this yaku incompatible with other yaku that utilizes other tile types. That includes yakuhai, shousangen, both sanshoku and sanshoku doukou, chanta, and finally honitsu and honroutou.
Yakuman
Due to the relatively high value of this yaku, chinitsu may be involved in the formation of kazoe yakuman.
Value
As a standalone yaku, chinitsu is at least a mangan, even when open. To regain the lost han as an open hand, it simply takes just one dora, or a combination with another yaku, just to bring the hand up to its close value of a haneman.
External links
- Chiniisou in Japanese Wikipedia
- Game designed with sou tiles only to train reading chinitsu hands.