Riposte( Dragon Compendium)
[Fighter Bonus Feat, General]
You are adept at striking from a defensive posture.
Combat Expertise (PH) , INT 13, Base attack bonus +5,
If you use Combat Expertise to increase your Armor Class, the first opponent to attack and miss you for that round provokes an attack of opportunity from you.
A fighter may select Riposte as one of his fighter bonus feats.