When you have your foe in a grapple, you know how apply the pressure with powerful knee strikes to the gut, head, or other sensitive area.

Prerequisites: Improved Unarmed Strike, Improved Grapple

Benefit: When you choose to do damage in a grapple using your unarmed strike, you can make a combat maneuver check. If successful, you automatically do maximum damage. (For example, if you would ordinarily deal 1d8+2 damage, you automatically deal 10 damage, instead.)