gameplay riichi
Ippatsu
一発
(いっぱつ)
Definition
A 1-han yaku for winning within one turn cycle after declaring riichi, before your next turn. Negated if someone calls kan during the cycle.
Related Terms
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.
Yaku
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.