Master the BJJ Arm Triangle Choke: A Step-by-Step Guide

**Step 1: Achieve Head and Arm Control.** Secure a strong head and arm control, typically from Side Control, scarf hold, or mount, ensuring your opponent's arm is trapped across their own neck.
**Step 2: Isolate the Arm and Head.** Thread your arm under their neck and over their trapped arm, connecting your hands with a gable grip, S-grip, or by grabbing your bicep.
**Step 3: Create Angle and Pressure.** Shift your body to a perpendicular angle relative to your opponent, bringing your chest over their head and applying pressure into their shoulder.
**Step 4: Walk Away and Finish.** Begin to walk your hips away from their head, tightening the choke by squeezing your elbows together and driving your chest down, effectively collapsing their shoulder into their neck.
**Step 5: Maintain Control and Squeeze.** Keep your hips heavy and maintain the angle, continuously squeezing until the tap.

**Head Position is Crucial:** Ensure your head is tight to your opponent's tricep or shoulder to prevent them from creating space and relieving pressure.
**Angle, Not Strength:** The power of the choke comes from the proper angle and hip pressure, not just arm strength. Avoid trying to muscle the squeeze.
**Trapping the Arm:** The opponent's arm must be deeply trapped across their neck to ensure effective carotid artery compression; don't let them pull it out.
**Common Mistake:** Not walking away enough, which prevents the proper angle and leverage needed for a tight, inescapable finish.

**Arm Triangle from Side Control:** A fundamental application, often transitioning from scarf hold or reverse Kesa Gatame.
**Arm Triangle from Mount:** Typically performed after a failed Armbar or if the opponent defends a traditional mounted choke.
**Arm Triangle from Half Guard Pass:** Applied as you pass half guard, trapping the arm and head as you clear the legs and solidify top control.

This technique works best when you have strong top control, especially in side control, Mount, or North-South. It's ideal when your opponent's arm is already elevated or can be easily isolated across their neck, or as a follow-up to failed armbar attempts where the opponent defends by tucking their arm.

**Create Space:** Immediately try to create space between your neck and their choking arm, pushing their bicep or shoulder.
**Posture Up/Bridge:** If from side control, bridge hard to disrupt their base and create an opening to escape, or turn into the choke to relieve pressure.
**Hand in the Collar/Neck:** Get your hand inside their grip or collar to create a frame and prevent the full squeeze, buying yourself time to escape.