Improved Bull Rush
From Compendium of Worldly Lore
Needs review
Source: Player's Handbook
Description: Your Bull Rush is more effective.
Prerequisites: STR 13, Power Attack
Required for: Awesome Blow
When you perform a bull rush you do not provoke an attack of opportunity from the defender. You also gain a +4 bonus on the opposed Strength check you make to push back the defender.
Special
A fighter may select Improved Bull Rush as one of his fighter bonus feats.