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Different [[yaku]] may be subject to [[rule variations]].  The variations may include altering the different strengths of the yaku, in relation to point values.  A number of yaku are simply not considered standard.
Different [[yaku]] may be subject to [[rule variations]].  The variations may include altering the different strengths of the yaku, in relation to point values.  A number of yaku are simply not considered standard.
==Chiitoitsu==
{{main|Chiitoitsu}}
Under most practices, chiitoitsu requires 7 unique pairs.


==Daburu riichi==
==Daburu riichi==
{{main|Double riichi}}
{{main|Double riichi}}
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Score [[riichi]] as 2 han yaku instead of 1 han if called within the first uninterrupted go-around of a hand.
Score [[riichi]] as 2 han yaku instead of 1 han if called within the first uninterrupted go-around of a hand.


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==Haitei and houtei==
==Haitei and houtei==
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Score the 1-han yaku [[haitei raoyue]] for winning with the last tile from the live wall, or score the 1-han yaku [[houtei raoyui]] for winning on a discard while the live wall is empty.
Score the 1-han yaku [[haitei raoyue]] for winning with the last tile from the live wall, or score the 1-han yaku [[houtei raoyui]] for winning on a discard while the live wall is empty.


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==Haitei and rinshan==
==Haitei and rinshan==
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
When a [[kan|kantsu]] is declared with exactly one tile left in the live wall, that tile, called the [[haitei|haiteihai]], is appended to the dead wall and never drawn. This rule makes the replacement tile the haiteihai, so winning with that tile scores both [[rinshan kaihou]] (winning after kan) and [[haitei raoyue]] (winning with the last tile).
When a [[kan|kantsu]] is declared with exactly one tile left in the live wall, that tile, called the [[haitei|haiteihai]], is appended to the dead wall and never drawn. This rule makes the replacement tile the haiteihai, so winning with that tile scores both [[rinshan kaihou]] (winning after kan) and [[haitei raoyue]] (winning with the last tile).


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==Ippatsu==
==Ippatsu==
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Score an additional han for winning a [[riichi]] declaration within the next go-around.
Score an additional han for winning a [[riichi]] declaration within the next go-around.


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==Kazoe yakuman==
==Kazoe yakuman==
{{main|Kazoe yakuman}}
{{main|Kazoe yakuman}}
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Score a hand with 13 han or more as a yakuman.
Score a hand with 13 han or more as a yakuman.


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== Kokushi and chankan ==
== Kokushi and chankan ==
{{main|Kokushi musou|Chankan}}
{{main|Kokushi musou|Chankan}}
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Sometimes, it is allowable for a tenpai kokushi musou to declare ron on an [[Kan|ankan]] and thereby invoking the ability for chankan.
Sometimes, it is allowable for a tenpai kokushi musou to declare ron on an [[Kan|ankan]] and thereby invoking the ability for chankan.


* Ari - Allowed
* Ari – Allowed
* Nashi - Disallowed
* Nashi – Disallowed


==Multiple yakuman==
==Multiple yakuman==
{{main|Multiple yakuman}}
{{main|Multiple yakuman}}
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Score each of the listed patterns as a double yakuman.
Score each of the listed patterns as a double yakuman.


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* 9 – Junsei chuuren poutou : Nine heavenly gates winning from the nine-sided wait 1112345678999.
* 9 – Junsei chuuren poutou : Nine heavenly gates winning from the nine-sided wait 1112345678999.


[[Yaku compatability|Different yakuman patterns]] may be combined.  However, scoring is handled differently as well.  Score more than one yakuman if multiple yakuman are achieved by the same hand.
[[Yaku compatibility|Different yakuman patterns]] may be combined.  However, scoring is handled differently as well.  Score more than one yakuman if multiple yakuman are achieved by the same hand.


* Ari – Add one yakuman per single yakuman, add two yakuman per double yakuman if allowed, and score the sum.
* Ari – Add one yakuman per single yakuman, add two yakuman per double yakuman if allowed, and score the sum.
* Nashi – Score only one yakuman per hand, or two yakuman if double yakuman are allowed.
* Nashi – Score only one yakuman per hand, or two yakuman if double yakuman are allowed.
==Open riichi==
{{rulevar
|WRR=Nashi |EMA=Nashi |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou=Nashi |Saikyou= |KML= |USPML= |Montr=Wait shape <!--For ease of adding columns-->
}}
Allow players to declare open riichi instead of a normal riichi. Open riichi is worth 2 han instead of the normal 1 han. The declarer must reveal his hand at the same time as he pays the bet of 1,000 points.
* Ari – Allow open riichi along with normal riichi.
* Wait shape – The declarer only needs to reveal 1, 4, 7, or 10 tiles if these completely describe the wait shape of the hand. The pair or pair wait must always be revealed.
* Nashi – Don't allow open riichi.
Sometimes, directly playing into an open riichi (ron) is penalized by yakuman value.


==Optional yaku==
==Optional yaku==
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===Daisharin===
===Daisharin===
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Daisharin is an [[optional yaku]].  This involves a closed hand with pairs of each of the simples of the suit, [[pinzu]].  Sometimes it is regarded as a [[yakuman]].  Otherwise, the hand is counted normally with its yaku counterparts.  The hand is at least 11 han with a combined [[chinitsu]], [[ryanpeikou]], [[tanyao]], and [[pinfu]].
Daisharin is an [[optional yaku]].  This involves a closed hand with pairs of each of the simples of the suit, [[pinzu]].  Sometimes it is regarded as a [[yakuman]].  Otherwise, the hand is counted normally with its yaku counterparts.  The hand is at least 11 han with a combined [[chinitsu]], [[ryanpeikou]], [[tanyao]], and [[pinfu]].


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For souzu and manzu, the hands are labeled as daichikurin and daisuurin, respectively.
For souzu and manzu, the hands are labeled as daichikurin and daisuurin, respectively.


===Open riichi===
Allow players to declare open riichi instead of a normal riichi. Open riichi is worth 2 han instead of the normal 1 han. The declarer must reveal his hand at the same time as he pays the bet of 1,000 points.
* Ari – Allow open riichi along with normal riichi.
* Wait shape – The declarer only needs to reveal 1, 4, 7, or 10 tiles if these completely describe the wait shape of the hand. The pair or pair wait must always be revealed.
* Nashi – Don't allow open riichi.
Sometimes, directly playing into an open riichi (ron) is penalized by yakuman value.
===Paarenchan===
===Paarenchan===
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
Score the eighth consecutive win of the same dealer as a [[Optional yaku|yakuman]].
}}
Score the eighth consecutive win of the same dealer as a yakuman.


* Ari - Yakuman scored.
* Ari - Yakuman scored.
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===Renhou===
===Renhou===
{{main|Renhou}}
{{main|Renhou}}
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
This is a yaku for winning on a discard before the winner's first turn in an uninterrupted go-around.
This is a yaku for winning on a discard before the winner's first turn in an uninterrupted go-around.


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===Daisangen and daisuushii===
===Daisangen and daisuushii===
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Impose a liability payment on the player who has dealt the third pon/kanned dragon tile, or the fourth pon/kanned wind tile, if the caller wins with [[daisangen]] (big three dragons) or [[daisuushii]] (big four winds) later.
Impose a liability payment on the player who has dealt the third pon/kanned dragon tile, or the fourth pon/kanned wind tile, if the caller wins with [[daisangen]] (big three dragons) or [[daisuushii]] (big four winds) later.


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===Suukantsu===
===Suukantsu===
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Impose a liability payment on the player who has dealt the fourth kanned tile, if the caller wins with [[suukantsu]] (four [[kantsu]]) later.
Impose a liability payment on the player who has dealt the fourth kanned tile, if the caller wins with [[suukantsu]] (four [[kantsu]]) later.


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===Daiminkan rinshan===
===Daiminkan rinshan===
{{main|Rinshan kaihou}}
 
{{rulevar
Require that a player pay for a hand, as for a ron, when his or her discard is called for [[daiminkan]] and the caller wins a tsumo for [[rinshan kaihou]] on the replacement tile.
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Require that a player pay for a hand, as for a ron, when his or her discard is called for [[daiminkan]] and the caller wins a tsumo for rinshan kaihou on the replacement tile.


* Ari – Player dealing into daiminkan pays for the whole hand.
* Ari – Player dealing into daiminkan pays for the whole hand.
* Nashi – All players pay for the hand, as normal for a tsumo.
* Nashi – All players pay for the hand, as normal for a tsumo.
==Pinfu tsumo==
{{main|Pinfu}}
Some variation applies to pinfu, whether it counts with tsumo or not.
* Ari - Pinfu and tsumo are counted as combined yaku as two han together
* Nashi - When tsumo, pinfu is not counted for one han


==Nagashi mangan==
==Nagashi mangan==
{{main|Nagashi mangan}}
{{main|Nagashi mangan}}
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Score a mangan upon exhaustive draw for having discarding only yaochuuhai during the entire hand, with none of the yaochuuhai having been called by other players, and without having called any tiles oneself. If this is allowed, there are additional rules decisions necessary: Does it count as a win, or merely as replacement of the noten penalty? Are concealed kantsu allowed?
Score a mangan upon exhaustive draw for having discarding only yaochuuhai during the entire hand, with none of the yaochuuhai having been called by other players, and without having called any tiles oneself. If this is allowed, there are additional rules decisions necessary: Does it count as a win, or merely as replacement of the noten penalty? Are concealed kantsu allowed?


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==Rinshan fu==
==Rinshan fu==
{{main|Rinshan kaihou}}
{{main|Rinshan kaihou}}
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Award a hand winning with the rinshanpai (kan replacement tile) the usual 2 fu for winning with a self-drawn tile.
Award a hand winning with the rinshanpai (kan replacement tile) the usual 2 fu for winning with a self-drawn tile.


* 2 fu – Award the hand 2 fu for tsumo.
* 2 fu – Award the hand 2 fu for tsumo.
* Nashi – Don't count any fu for tsumo on the rinshanpai.
* Nashi – Don't count any fu for tsumo on the rinshanpai.
==Ryuuiisou==
A limit may be imposed on [[ryuuiisou]] to include or exclude [[hatsu]].
* Incl – Include hatsu
* Req – Require hatsu
* Excl – Exclude hatsu


==Tenhou and chiihou==
==Tenhou and chiihou==
{{main|Tenhou and chiihou}}
{{main|Tenhou and chiihou}}
{{rulevar
 
|WRR= |EMA= |JPML= |NPM= |Saikou= |Mu= |RMU= |101= |Tenhou= |Saikyou= |KML= |USPML= |Montr= <!--For ease of adding columns-->
}}
Score a self-drawn win within a hand's first uninterrupted go-around as a yakuman.
Score a self-drawn win within a hand's first uninterrupted go-around as a yakuman.


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