Chiniisou

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Chiniisou
Type Yaku
Kanji 清一色
English Flush
Value 6 han (closed)
5 han (open)
Speed Slow
Difficulty Medium
Example(s)
More examples

Chiniisou 「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. This yaku is usually referred to as chinitsu or, occasionally, chiniisou.

Tile patterns

Using pinzu:

Tile-1p.pngTile-2p.pngTile-3p.pngTile-4p.pngTile-4p.pngTile-5p.pngTile-5p.pngTile-7p.pngTile-7p.pngTile-8p.pngTile-8p.pngTile-9p.pngTile-9p.png Waiting for: Tile-4p.pngTile-5p.png

Using manzu:

Tile-2m.pngTile-3m.pngTile-4m.pngTile-5m.pngTile-5m.pngTile-6m.pngTile-6m.pngTile-6m.pngTile-7m.pngTile-7m.pngTile-8m.pngTile-9m.pngTile-9m.png Waiting for: Tile-1m.pngTile-4m.pngTile-7m.pngTile-8m.png

Using souzu:

Tile-1s.pngTile-2s.pngTile-3s.pngTile-3s.pngTile-4s.pngTile-5s.pngTile-6s.pngTile-6s.pngTile-6s.pngTile-7s.pngTile-7s.pngTile-8s.pngTile-8s.png Waiting for: Tile-3s.pngTile-6s.pngTile-7s.pngTile-8s.pngTile-9s.png

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 very 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. The number of potential waiting tiles may range from one tile of the suit to all nine tiles. Strings of consecutive numbers enable this complexity. Without the help of computers, this complexity increases the difficulty in determining the winning tiles upon tenpai.

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
CHN 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 red x.png 13 red x.png 13 red x.png 13 green check.png 13 green check.png 13 green check.png 13 grey.png 13 green check.png 13 green check.png 13 red x.png 13 red x.png 13 red x.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png

Chinitsu requires a single suit, so that deems this yaku incompatible with other yaku that demand other tile types. That includes yakuhai, shousangen, as well as sanshoku and sanshoku doukou. Since chinitsu implies honitsu, the latter is not counted together. If combined with chanta, the hand is actually junchan, so that yaku is counted instead. Finally, chinitsu and honroutou would require a hand containing at most eight tiles (the 1s and 9s of one suit), which is impossible.

Yakuman

Due to the relatively high value of this yaku, chinitsu may be involved in the formation of kazoe yakuman. Especially when closed, the 6-han is enough to be almost half necessary to acquire 13-han. Naturally, other yaku and/or dora will have to compose the rest. Though, one particular pattern may form as the yakuman, chuuren poutou.

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.

Han/Fu Ron Han/Fu Tsumo
Non-dealer Dealer Non-dealer Dealer
Possible minimum/maximum point values
While open While open
Mangan 8000 12000 Mangan 2000/4000 4000 all
Closed Closed
Haneman 12000 18000 Haneman 3000/6000 6000 all

External links

Chiniisou in Japanese Wikipedia
Game designed with sou tiles only to train reading chinitsu hands.