Anti-bulge

Anti-bulge  

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

Takagawa-Kitani, 14th Honinbo game 2  

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

Bulge attempt  

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

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