Combat Expertise
(Player's Handbook v.3.5, page 92, DnD 3.5)
[General, Fighter Bonus Feat]
You are trained at using your combat skill for defense as well as offense.
Prerequisite
INT 13
Benefit
When you use the attack action or the full attack action in melee, you can take a penalty of as much as -5 on your attack roll and add the same number (+5 or less) as a dodge bonus to your Armor Class. This number may not exceed your base attack bonus. The changes to attack rolls and Armor Class last until your next action.
Special
A fighter may select Combat Expertise as one of his fighter bonus feats (see page 38).
Normal
A character without the Combat Expertise feat can fight defensively while using the attack or full attack action to take a -4 penalty on attack rolls and gain a +2 dodge bonus to Armor Class.