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Three-space extension
Path: DiagonalAttachmentPath · Prev: · Next: DiagonalAttachmentAsInferiorShape
Difficulty: Beginner
Keywords: Opening
Compared with two-space extension
Compared with the two-space extension, the three-space extension has two advantages, which can be explained using go concepts, and one clear disadvantage.
To start with the disadvantage. White can invade at
One major reason to choose to play the three-space extension can be seen in this sequence. If White is about to play the diagonal attachment at
The second possible advantage is if Black is seeking to play lightly - stay out of trouble. This type of sequence is appropriate if White is strong in the upper right, as here. In that case Black a, White b might be good for White, and Black is better allowing
Here Black can be quite happy with his development. List of basic types
There are pages dealing with invasions in these extensions on the three-space extension invasions path.
Path: DiagonalAttachmentPath · Prev: · Next: DiagonalAttachmentAsInferiorShape This is a copy of the living page "Three-space extension" at Sensei's Library. ![]() |