Combat Tactician( Player's Handbook II, p. 77)
You excel at approaching an opponent from an unexpected direction to deliver deadly attacks. As you approach your foe, you duck and weave to confuse his defenses. Alternatively, you draw a weapon and make a quick attack that surprises your foe.
Dodge (PH) , DEX 13, base attack bonus +12,
You can designate one specifi c foe as the target of this feat as a free action. If neither you nor the target threatens each other at the start of your turn, you gain a +2 bonus on melee damage against that target during your turn.