17 rule sets, from Hong Kong parlours and Japanese professional leagues to Sichuan teahouses, Singaporean animal tiles and the American card — how many play, how many tiles, how big the hand, and how it scores.
Want the three biggest styles side by side? See Rules compared.
Competition & ModernPublished in 1998 for competition: an 81-pattern scoring list and an eight-point minimum. Used for world and European championships.
Competition & ModernRiichi rules standardised for international tournaments, usually without red fives or with restricted optional yaku.
Competition & ModernA modern Chinese rule set balancing classic hands with clear, compact scoring.