You can lower your defenses in order to improve your aggressive swordplay.

Prerequisite(s): Combat Expertise, 1st-level duelist

Benefit: If you are wielding a light or one-handed piercing weapon and wearing light or no armor, you can take a -1 penalty to your armor class and Combat Maneuver Defense in order to gain a +2 bonus to your parry attack rolls, disarm and trip attempts, and attack rolls for attacks of opportunity. When you have attained 5 levels of the duelist class, the penalty increases to -2 and the bonus to +4. When you have attained 9 levels of the duelist class, the penalty increases to -3 and the bonus to +6. You must choose to use this feat before making an attack roll, and its effects last until your next turn.