National Mah Jongg League Rule and Strategy Posts from ModernMahjong.c – Modern Mahjong
combinatorics - How many winning hands are possible in Mahjong? - Mathematics Stack Exchange
Impossible combination outside of sanma : r/mahjongsoul
Having spent now YEARS trying and failing to learn the impossible to understand game of Mahjong, can anyone explain why this isn't a hand? : r/yakuzagames