World Riichi Championship rules

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World Riichi Championship rules ruleset
Kuitan, atozuke Ari-Ari
Starting points 30,000
Ending points
Negative score Game end
(total ante)
(placement bonus)
Modified for ties
Renchan setting Tenpai-renchan
Abortive draws None

The World Riichi Rules consist of combined 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 rules apply regular Japanese mahjong rules with some notable differences. The following organizations and their rulesets were put into consideration:

Basic rules

Basic rules to the game are essentially the same. Game mechanics regarding turn order, tile calls, and 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, 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.

Tochuu ryuukyoku

Abortive draws are completely omitted from the tournament.


The uma for the tournament uses 「+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:

Session score = ((points – 30,000) / 1,000) + uma


Every yakuman is counted as single yakuman. Plus, the maximum points awarded for any hand is capped as that of a single yakuman.

Kazoe yakuman

Normally, a hand worth 13 han or more is classed as a yakuman. However, this value is reduced to sanbaiman.

External links