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* [http://tenhou.net/0/?log=2013080614gm-0089-0000-x339040987b74&tw=1&ts=7 With] [[junchan]].
* [http://tenhou.net/0/?log=2013080614gm-0089-0000-x339040987b74&tw=1&ts=7 With] [[junchan]].
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'''Chiniisou''' {{kana|清一色}} is a standard [[List of yaku#Six han|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, '''chinichi'''.
'''Chiniisou''' {{kana|清一色}}, often called '''chinitsu''' {{kana|清一}}, is a [[yaku]] scored when the hand only has tiles of a single numbered suit. It is worth 6 han, but reduced to 5 if opened. It is sometimes called '''chinichi'''.  


==Tile patterns==
==Tile patterns==
[[Image:Chinitsu.jpg|250px|thumb|right|Chinitsu scored at a [[Chicago Area Mahjong]] session.]]


'''Using [[pinzu]]:'''
'''Using [[pinzu]]:'''
Line 44: Line 45:


==Formation==
==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.
Since only one suit can be used for this yaku, tiles of the two other suits will be discarded. As a consequence, a player aiming for a honitsu/chinitsu will often discard tiles of two suits. This is especially true when middle tiles and/or [[dora]] are discarded early on.


===Complex wait patterns===
===Complex wait patterns===
Chinitsu is notorious for developing complex [[Machi#Complex_patterns|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.
Chinitsu is notorious for developing complex [[Machi#Complex_patterns|wait patterns]]. Since all 13 tiles are of one suit, it is easy for groups to mix together, forming multi-sided waits.


=== Compatibility ===
== Compatibility ==
{{main|Yaku compatibility}}
{{main|Yaku compatibility}}


{{Yaku compatibility table|CHN}}
{{Yaku compatibility table|CHN}}


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.
Chinitsu requires a single suit with no honors. [[Yakuhai]], [[shousangen]], [[sanshoku]], and [[sanshoku doukou]] all require honors or multiple suits, and are thus incompatible. Chinitsu implies [[honitsu]], so they are 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 ==
== Value ==
As a standalone yaku, chinitsu is at least a [[mangan]] open and a [[haneman]] closed. An open chinitsu can easily become a haneman with a [[dora]] or another yaku.


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 closed value of a haneman.
===Yakuman===
Due to the relatively high value of this yaku, chinitsu may be involved in the formation of [[kazoe yakuman]], especially closed. A closed chinitsu, worth 6 han, is almost half the requirement of 13 han; other yaku and/or dora will need to provide the rest. A certain pattern of chinitsu hand can become a regular yakuman, [[chuuren poutou]].


==External links==
==External links==

Latest revision as of 13:42, 12 August 2024

Chiniisou 「清一色」, often called chinitsu 「清一」, is a yaku scored when the hand only has tiles of a single numbered suit. It is worth 6 han, but reduced to 5 if opened. It is sometimes called chinichi.

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

Tile patterns

 
Chinitsu scored at a Chicago Area Mahjong session.

Using pinzu:

              Waiting for:   

Using manzu:

              Waiting for:     

Using souzu:

              Waiting for:      

Formation

Since only one suit can be used for this yaku, tiles of the two other suits will be discarded. As a consequence, a player aiming for a honitsu/chinitsu will often discard tiles of two suits. This is especially true when middle tiles and/or dora are discarded early on.

Complex wait patterns

Chinitsu is notorious for developing complex wait patterns. Since all 13 tiles are of one suit, it is easy for groups to mix together, forming multi-sided waits.

Compatibility

Main article: Yaku compatibility

^ 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                                                  

Chinitsu requires a single suit with no honors. Yakuhai, shousangen, sanshoku, and sanshoku doukou all require honors or multiple suits, and are thus incompatible. Chinitsu implies honitsu, so they are 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.

Value

As a standalone yaku, chinitsu is at least a mangan open and a haneman closed. An open chinitsu can easily become a haneman with a dora or another yaku.

Yakuman

Due to the relatively high value of this yaku, chinitsu may be involved in the formation of kazoe yakuman, especially closed. A closed chinitsu, worth 6 han, is almost half the requirement of 13 han; other yaku and/or dora will need to provide the rest. A certain pattern of chinitsu hand can become a regular yakuman, chuuren poutou.

External links

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