Improved Two-Weapon Defense( Complete Warrior, p. 101)
[Fighter Bonus Feat, General]
You gain a signifi cant defensive advantage while fighting with two weapons.
Greater Two-Weapon Defense (CW) ,
When wielding two weapons (not including natural weapons or unarmed strikes), you gain a +2 shield bonus to your Armor Class. When you are fighting defensively or using the total defense action, this shield bonus increases to +4.
A fighter may select Improved Two-Weapon Defense as one of his fighter bonus feats.