Five-space extension

    Keywords: Opening

Chinese 1: 拆五 (chāi wǔ)
Chinese 2: 五间拆 (wǔ jiān chāi)
Japanese: 五間ビラキ (goken-biraki)
Korean: -

An extension of five lines on the side is easy to invade, perhaps. But Yang Yilun teaches that it is good as framework (ie with building territory in mind).

Five-space extension  

This extension may be appropriate if the first black stone doesn't need immediate support.


If Black is able to add black+circle, this becomes a good 'tent' formation.

Charles Matthews


High enclosure  

Black can also play at B1 (or even at a), with a good relation to the extension.

Velobici: According to Yang Yilun, as I have understood my son's teaching games: A five-space extension from a corner on an open side of the board is allows the either the building of territory or the creation of two strong positions on the side. A five-space extension is not good if it approaches a strong position of the other player.

An open side is a side of the board in which only corner plays have been made resulting in between 9 and 11 lines between the the two corner positions.

An open side  
Good for Black  
Not good for Black  

Five-space extension last edited by ajisubarashii on May 4, 2016 - 11:52
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