hand structure riichi
Penchan
辺張
(ぺんちゃん)
Definition
An edge wait - waiting for 3 with 12, or waiting for 7 with 89. Only 4 tiles available, making it a weak wait.
Related Terms
Kanchan
嵌張
A closed wait or inside straight wait. Waiting for the middle tile of a sequence (e.g., 35 waiting for 4). The least flexible wait pattern with only 4 tiles available.
Ryanmen
両面
Double-sided wait - the strongest wait pattern, waiting on either side of a sequence (e.g., 45 waits on 3 or 6). 8 tiles available.
Tanki
単騎
Single wait - waiting to complete your pair. Only 3 tiles available (since you already have one). Common in kokushi and chiitoi.