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| The '''World Riichi Rules''' consist of combined [[Rule variations|rulesets]] applied by the [[EMA]] and contemporary Japanese rules. The rules document is authored by Sylvain Malbec and is accepted by the EMA, [[JPML]], and the rest of the tournament participants. The rules were applied to the [[World Riichi Championship]]. | | The '''World Riichi Rules''' were used by the [[World Riichi Championship]] and authored by Sylvain Malbec. It combines the [[Rule variations|rulesets]] of the [[EMA]] and contemporary Japanese rules. |
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| == Summary == | | == Summary == |
| The rules apply regular [[Japanese mahjong]] rules with some notable differences. The following organizations and their rulesets were put into consideration:
| | Basic rules, such as turn order, [[tile calls]], and available [[yaku]], are the same as any regular Japanese mahjong ruleset. |
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| * [[European Mahjong Association]] (EMA) | | * [[European Mahjong Association]] (EMA) |
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| * [[United States Professional Mahjong League]] (USPML) | | * [[United States Professional Mahjong League]] (USPML) |
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| === Basic rules === | | == Rule list == |
| Basic rules to the game are essentially the same. Game mechanics regarding turn order, [[Naki|tile calls]], and [[List of yaku|yaku]] are inherently the same. Rule differences are generally applicable using ari (on) or nashi (off) on various rule settings and variations. Any major differences are listed.
| | *'''Kuitan''' (open tanyao): On |
| | | *'''Atozuke''': On |
| == Kuitan ==
| | *'''[[Oka]]''': Off |
| {{Main|Kuitan}}
| | *'''[[Uma]]''': {{uma|+15|+5|-5|-15}}. If players tie, uma is averaged. |
| | | *'''[[Abortive draws]]''': None |
| Kuitan, or open tanyao, is allowed in the WRC rules. During the planning stages of the first WRC, there were initial plans to prohibit kuitan at the behest of the EMA. However, after some discussion, the stakeholders chose to allow kuitan instead.
| | *'''[[Chombo]]''': -30 (as of the 2022 edition), applied after [[uma]]. Originally set to -20. |
| | | *'''[[Yakuman]]''': Hands can score a single yakuman maximum. |
| == Tochuu ryuukyoku ==
| | *'''[[Kazoe yakuman]]''': Off - a 13+ han hand is scored as a [[sanbaiman]]. |
| {{main|Tochuu ryuukyoku}}
| | *'''[[Pao]]''': On for [[daisangen]], [[daisuushii]], and [[suukantsu]]. |
| Abortive draws are completely omitted from the tournament.
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| == Uma ==
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| {{main|Uma}}
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| The uma for the tournament uses {{uma|+15|+5|-5|-15}}. However, in the event of a tie between players, then the uma is adjusted to accommodate the tie. At the end, the end game score is calculated as follows:
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| Session score = ((points – 30,000) / 1,000) + uma
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| == Yakuman ==
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| {{main|Yakuman|Multiple yakuman}}
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| Every yakuman is counted as single yakuman. Plus, the maximum points awarded for any hand is capped as that of a single yakuman.
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| === Kazoe yakuman ===
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| {{main|Kazoe yakuman}}
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| Normally, a hand worth 13 han or more is classed as a [[yakuman]]. However, this value is reduced to [[sanbaiman]].
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| === Multiple yakuman ===
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| {{main|Multiple yakuman}}
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| === Yakuman pao ===
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| {{main|Pao}}
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| == Chombo ==
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| {{main|Chombo}}
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| The penalty for chombo was originally set to -20, post-game after factoring uma. For the [[2022 World Riichi Championship|2022 edition]], the penalty was increased to -30.
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| == External links == | | == External links == |