Crane Riposte (Combat)Source Ultimate Combat pg. 1 (Amazon)
You use your defensive abilities to make overpowering counterattacks.
Prerequisites: Crane Style, Crane Wing, Dodge, Improved Unarmed Strike, base attack bonus +8 or monk level 7th.
Benefit: You take only a –1 penalty on attack rolls for fighting defensively. Whenever you use Crane Wing to deflect an opponent’s attack, you can make an attack of opportunity against that opponent after the attack is deflected. Source Pathfinder Unchained pg. 116 (Amazon)
At the start of a turn when you are fighting defensively, you can spend 2 stamina points to take no penalty on your attack rolls from fighting defensively. This lasts until the start of your turn.