Riichi vs MCR
Riichi and MCR are the two most precise competitive mahjong rulesets — Riichi dominates Japan and online play, MCR is the international tournament standard. They share the same 14-tile hand structure but diverge sharply in how they score it.
Han + fu scoring with the riichi declaration mechanic.
81 fan patterns with strict exclusion rules and 8-fan minimum.
Riichi vs MCR — every axis
| Axis | Riichi | MCR |
|---|---|---|
| Origin | Post-war Japan, 1950s | China, codified in 2002 by WMSC |
| Hand size | 14 tiles (4 melds + pair) | 14 tiles (4 melds + pair) |
| Scoring unit | Han (yaku count) × fu (structure) | Fan (flat 1–88 per pattern) |
| Pattern count | ~33 yaku + dora | 81 fan patterns |
| Minimum to declare | 1 yaku (no yakuless wins) | 8 fan from scoring patterns |
| Exclusion rules | Implicit (yaku stack within limits) | Strict explicit table |
| Tournament play | World Riichi Championship, EMA | World Mahjong Sports Games |
| Online play | Tenhou, Mahjong Soul, MahjongSwift | Limited online presence |
| Signature mechanic | Riichi declaration (1000-point bet) | Chicken Hand rule (8 fan fallback) |
| Lucky bonuses | Dora, akadora, ura dora, ippatsu | Flowers only (1 fan each) |
Strengths
- •Faster scoring during play — fewer patterns to memorize
- •More strategic depth around concealment and riichi timing
- •Massive online ecosystem and learning resources
- •Dora randomness keeps casual games interesting
- •Eliminates ambiguity — every hand has one canonical score
- •Patterns are more granular, rewarding hand-building creativity
- •No luck-based bonuses — pure skill expression
- •International standard for cross-cultural tournament play
Which should you play?
Pick Riichi if you want the deepest competitive variant with the largest online community, or if you grew up with anime mahjong. Pick MCR if you want the most precise scoring system, plan to attend international tournaments, or prefer pattern-discovery puzzles over riichi-style risk management.
Common questions
Which variant is harder to learn?+
MCR has more patterns to memorize (81 vs ~33), but each one is a flat rule. Riichi has fewer yaku but adds the fu system, riichi mechanics, dora, and limit-hand caps — about the same total complexity, distributed differently.
Can I switch between Riichi and MCR easily?+
The hand structure is the same so the tile reading skill transfers, but scoring is totally different — you'll need to re-learn what hands are worth playing for. Players who know one usually pick up the other in a few weeks.
Why does MCR feel slower than Riichi?+
MCR's 8-fan minimum forces you to chase bigger patterns — All Pungs alone (6 fan) won't even win. Combined with no riichi-style force-out mechanic, MCR rewards patience over Riichi's faster declaration cycle.