Big bulge

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  Difficulty: Intermediate   Keywords: Joseki, Shape

Alex Weldon: This is a term coined in Charles Matthews' book [ext] Shape Up! and introduced to Sensei's on the Shape Problem 4 / Discussion page. I don't know much about it, except that it's a good shape, but I'm hoping that creating a page about it will serve as an inducing move to get those more knowledgeable than me to write about it. :)

Some people call this the boomerang shape.

[Diagram]

Big bulge

Abstractly, the Big bulge is the shape formed by three stones with a keima-keima-ogeima relationship, as shown here. It's a good shape because it's flexible, but also very well connected.

[Diagram]

One big bulge joseki

I know of two common joseki that involve this shape. One arises from a 4-4 point one space low pincer invasion block, and looks like this.

[Diagram]

And another

The other joseki I know that involves this shape comes from the 4-5 point 4-3 approach keima joseki. It looks like this.


Charles If I can comment on the feeling behind the name: it came from examples like this one.

[Diagram]

Move 115

Here B1 plays steadily for influence in the centre, to counter-act White's power there. (The game is Takagi Shoichi-Kobayashi Koichi (B) 1988-01-07.)


[Diagram]

Move 27

maruseru: This shape also occurs in Yu-Ch'ang-hyeok-Yi Se-tol (B) played 2000-12-20. This game (but not the particular move) is commented in Go-World #91 pp. 33-39.


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This is a copy of the living page "Big bulge" at Sensei's Library.
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