Missing suit

Missing suit, often called 'ding que' or 'lack a suit,' is a defining rule of Sichuan (Chengdu) bloody-battle mahjong. At the very start of the hand, before serious play, each player privately commits to one of the three numbered suits — characters (wan/m), bamboo (sou/s), or dots (pin/p) — that they will treat as forbidden. They must discard every tile of that chosen suit and may never use it in a winning hand. Sichuan mahjong removes the honor tiles entirely, so only these three suits exist.

The rule forces every hand toward a two-suit structure, since one suit is voluntarily abandoned. This pushes hands naturally toward flush-like shapes and makes the popular 'qing yi se' (full flush, single suit) goal much more reachable. Practically, if you declare characters as your missing suit, you must dump tiles like 3m and 7m immediately and build only from dots and bamboo. Holding onto or winning with a tile from your declared missing suit is illegal and is penalized.

The commitment is strategically heavy because it is locked for the whole hand and is partly visible through your early discards: opponents quickly read which suit you abandoned and adjust their reads. A key consequence is that a player cannot win on a tile of their own missing suit even by accident. Beginners sometimes confuse missing suit with simply not having a suit yet — it is an enforced declaration, not a coincidence, and a wrong claim on a missing-suit tile draws a penalty. Combined with bloody-battle continuation, missing suit is what gives Sichuan mahjong its fast, aggressive, flush-chasing character.