scoring riichi
Yaku
役
(やく)
Definition
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.
Related Terms
Han
翻
Doubles or multipliers that determine your hand's value. Each yaku is worth a certain number of han. Combined with fu to calculate the final score.
Riichi
立直
Declaring ready - a 1-han yaku and core mechanic of Japanese mahjong. Declared when in tenpai with a closed hand by paying 1,000 points and placing a stick. Locks your hand but enables additional yaku.
Tanyao
断么九
All simples - a 1-han yaku where your entire hand consists only of numbered tiles 2-8. No terminals or honors. Can be open (kuitan) or closed depending on rules.