Anti-bulge is a term coined by Bill Spight for a play that prevents a bulge by taking the apex of the potential bulge formation. The basic anti-bulge is a combination of a stretch and a peek.


This anti-bulge, W1, is big. If Black plays the bulge White’s stones become very weak. Also, W1 threatens the push through at a.

Takagawa-Kitani, 14th Honinbo game 2  

At a more advanced level, W2 is also an anti-bulge: Black would love to play a.

Bulge attempt  

If Black does so, then White can play W4 and W6, thanks to W2. Black is confined to the top and White has the central power.

You could think of W2 as a pre-emptive peep at a tiger's mouth or a compromised diagonal.

Anti-bulge last edited by PJTraill on November 11, 2019 - 19:00
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