Ruleset library

Mahjong is a family, not one fixed rulebook.

The tiles may look familiar across tables. What counts, scores, and wins can change. Always name the ruleset.

Chinese / MCRInternational competition rules derived from Chinese Mahjong, with 81 scoring elements and an 8-point minimum.

SichuanA regional family of fast rules; common Blood Battle formats omit honors and keep play moving after a win.

Hong KongA widely played Chinese rules family with a compact fan-based scoring tradition and substantial table variation.

RiichiJapanese rules centered on yaku, riichi declarations, dora, and furiten.

AmericanA distinct American game using an annual card, Jokers, extra Flowers, racks, and the Charleston pass.

Comparison cluster

Seven rules pages with explicit scope

Each guide separates shared structure from the rule that actually decides a win.

Current tool scope