Variant-Specific
sichuan
Missing suit
Also called: 缺一门, Sichuan rule
Sichuan-only: at start of round, you commit to discarding all tiles of one suit.
Missing suit (缺一门) is the defining rule of Sichuan mahjong. Before each round, every player commits to one of the three suits (m, p, or s) as their 'missing' suit. You must discard every tile of that suit before you can declare victory — and your winning hand cannot contain a single tile of your missing suit. This single rule forces aggressive defensive play and is part of why Sichuan rounds finish so fast.
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