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Improved Dirty Trick (Combat)

Source Advanced Player's Guide pg. 162
You are skilled at pulling dirty tricks on your foes.

Prerequisites: Int 13, Combat Expertise.

Benefit: You do not provoke an attack of opportunity when performing a dirty trick combat maneuver. In addition, you receive a +2 bonus on checks made to attempt a dirty trick. You also receive a +2 bonus to your Combat Maneuver Defense when an opponent tries a dirty trick on you.

Normal: You provoke an attack of opportunity when performing a dirty trick combat maneuver.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 123
You can select this feat even if you don’t meet the ability score prerequisite (Intelligence 13). You gain the benefits of this feat only as long as you have at least 1 stamina point in your stamina pool. When you are the target of a dirty trickAPG combat maneuver, you can spend a number of stamina points up to your Strength or Dexterity bonus, whichever is greater. Your CMD against that dirty trick attempt increases by that number.

Mythic Improved Dirty Trick

Source Mythic Adventures pg. 66
You’re a paragon of down-and-dirty fighting.

Prerequisites: Improved Dirty TrickAPG.

Benefit: You gain a bonus equal to half your tier on checks to attempt a dirty trick, and to your CMD when an opponent attempts to perform a dirty trick on you. These bonuses stack with those granted by Improved Dirty Trick.

Furthermore, you can make an attack of opportunity against any creature that attempts a dirty trick maneuver against you, unless it also has this feat.