ponnuki
{{nofootnotes|date=November 2010}}
{{Nihongo|Ponnuki|ポン抜き|ponnuki|{{CJKV|t=開花|l=open flower|s=开花|p=kāi huā|k=빵따냄 ppang-ttanaem or 빵때림 ppang-ttaerim}}}} is a Japanese term in the game of Go that refers to capturing a single stone, resulting in a diamond shape. The shape of the remaining capturing stones is considered to be very strong, due to its influence in all directions. A certain Go proverb says: "A Ponnuki is worth 30 points".
| align="right" style="border:1px solid black;padding: 1px;text-align: center"
|{{Goban 9x9| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |b| | | | | | | |b1|w|b| | | | | | | |b| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |20}} Ponnuki move by Black 1 |
A diamond shape (4 stones touching the same empty spot) is considered a ponnuki only when constructed by capturing the middle stone.
Depending on the context (other stones on the board), a ponnuki may be strong and thick but inefficient (overconcentrated).
Etymology
The word ponnuki (ポン抜き) breaks up into pon and nuki, in which pon is the sound of a cork when taken from a bottle, while nuki means "taking out" (noun), the expression means, 'to pop the cork', a poetic reference to taking the stone out of the centre.