hand structure riichi

Ittsu

一気通貫

(いっつう)

Definition

Pure straight - a 2-han (closed) or 1-han (open) yaku where you have 123, 456, and 789 of the same suit.

順子

Three consecutive numbered tiles of the same suit (e.g., 456 of bamboo). Also called shuntsu or run.

役

Scoring patterns or hands. You must have at least one yaku to win (except with riichi). Each yaku is worth a certain number of han.