World Riichi Championship rules
The World Riichi Rules were used by the World Riichi Championship and authored by Sylvain Malbec. It combines the rulesets of the EMA and contemporary Japanese rules.
| World Riichi Championship rules ruleset | |
|---|---|
| Kuitan, atozuke | Ari-Ari |
| Starting points | 30,000 |
| Ending points (Target) |
30,000 |
| Negative score | Game end |
| Oka (total ante) |
0 |
| Uma (placement bonus) |
+15/+5 Modified for ties |
| Renchan setting | Tenpai-renchan |
| Abortive draws | None |
Summary
Basic rules, such as turn order, tile calls, and available yaku, are the same as any regular Japanese mahjong ruleset.
The following organizations and their rulesets were put into consideration:
Rule list
- Kuitan (open tanyao): On
- Atozuke: On
- Oka: Off
- Uma: 「+15 / +5 / -5 / -15」. If players tie, uma is averaged (e.g. if two players tie for 1st, both gain +10).
- Abortive draws: None
- Chombo: -30 (as of the 2022 edition), applied after uma.
- Before 2022: -20.
- Yakuman: Hands can score a single yakuman maximum.
- Kazoe yakuman: Off - a 13+ han hand is scored as a sanbaiman.
- Pao: On for daisangen, daisuushii, and suukantsu.