Ruleset guide
MCR Mahjong Rules Explained
Mahjong variants share tiles and vocabulary, but procedure and scoring must stay attached to a named ruleset.
Context: MCRMCR is a four-player standardized Chinese ruleset with formal procedure, an 81-fan catalogue, and an official minimum-points requirement.
Shared foundation
MCR uses the three numbered suits, honors, and bonus Flowers and Seasons.
- Seat and prevalent Winds are named.
- Bonus tiles are replaced.
- Standard and recognized special structures can win.
Defining rules
Structure is only the first validation step; fan must be combined under official exclusions and reach the required minimum.
- The Hand Checker does not calculate fan.
- Competition rulings require the current Green Book.
- Learn flow before the full scoring catalogue.
At the table
Use the official or organizer-approved document for disputes. Agree on minimums, bonuses, payments, and local options before dealing.
Key takeaways
- MCR uses the three numbered suits, honors, and bonus Flowers and Seasons.
- Structure is only the first validation step; fan must be combined under official exclusions and reach the required minimum.
- Do not merge advice from different rulesets.
Questions beginners ask
Does four melds and a pair always win in MCR?
No. The hand must also satisfy the official scoring minimum and all applicable rules.
Lesson checkpoint
Finish lesson & practice Turn the explanation into recall.
Source notes
Reviewed references
- Mahjong Competition RulesWorld Mahjong Organization / European Mahjong Association ยท Reviewed 2026-10-14
MCR structure, play sequence, 81 scoring elements, and the 8-point minimum.