If you are fighting with a one-handed weapon or a light weapon and carrying nothing in your off hand, the Einhander feat grants you access to three special tactical maneuvers.

Narrow Profile: You can tuck your arm behind your back and offer a narrow profile when you concentrate on defense rather than offense. You gain an additional +2 dodge bonus to AC when fighting defensively or using the total defense action.

Off-Hand Balance: You use your off hand to balance yourself while performing acrobatic maneuvers. After you successfully strike an opponent, you gain a +2 bonus on Acrobatics checks to avoid his attacks of opportunity until the start of your next turn. When you flip and roll out of harm's way, you use one hand to keep your balance and your other hand to keep your weapon trained on your foe.

Rising Stoccata: With a flourish, you step forward, and launch a series of rapid thrusts with your weapon. You must 5-ft step and do a melee full-attack to use this maneuver. You make number of attacks equal to your base attack bonus (this replaces your normal full attack routine), but you do not add your base attack bonus to the attack rolls. You apply any precision-based bonus damage, such as sneak attack, sudden strike, skirmish, to only the first attack.