noun
penchan wait; one-sided wait for a 3 or 7
Mahjong term: a wait for the end tile of a run (e.g., holding 1-2 waiting for 3, or holding 8-9 waiting for 7). Often used in the phrase 辺張待ち (ペンチャンまち).
from Chinese
See also: 辺張待ち (ペンチャンまち)
辺張待ちは、両面待ちよりあがりにくい。
A penchan wait is harder to win on than a ryanmen wait.
この手は辺張の3索待ちだ。
This hand is waiting for the 3 of bamboo on a penchan.
A closed wait (e.g., 4-6 waiting for 5), another type of one-tile wait.
From Chinese mahjong terminology; the exact derivation is uncertain, but the kanji 辺 (edge) and 張 (stretch/extend) suggest the idea of waiting for the edge tile of a sequence.