Arm Triangle
Arm triangle — kata gatame and the head and arm choke are the same strangle. Near arm across the throat, attacking arm over the neck, angle walk to finish.
Adapted from InGrappling, Arm Triangle. System Games did not invent this curriculum.
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The arm triangle uses the opponent’s own near arm as one side of a triangle against their neck. The attacking player pulls the near arm across the opponent’s throat and wraps their own arm over the neck, creating a closed loop — the opponent’s arm compresses one side of the neck, and the attacking arm compresses the other side from over the top. This is a bilateral vascular choke.
It is finished from side control and kata gatame. Mount is where it is usually set rather than where it is closed — the attacker dismounts to the trapped-arm side to load the far carotid, which is why a square finish fails. It is one of the most common and reliable submissions in grappling because the entry reads are clear, the mechanics are straightforward, and the finish is achievable without exceptional flexibility or strength.
The most important technical fact about it: the finish requires moving to a specific angle. Attempting to finish from straight side control is the most common error — and the most common reason arm triangles fail. The angle requirement is non-negotiable for bilateral carotid compression.
The arm triangle, the head and arm choke and kata gatame are the same submission. The configuration is identical in all three: the opponent’s near arm trapped across their own throat, the attacker’s arm over the neck, the loop closed and the angle walked. The names come from different traditions — “arm triangle” from the shape, “head and arm” from wrestling, kata gatame from judo — and none of them describes a different strangle.
This page carries all of it under the arm triangle name.
One distinction is real and worth keeping. Kata gatame also names a pin — the head-and-arm hold as a control position, occupied without finishing. That position has its own page at Kata Gatame, and it is worth studying separately because holding it is a different skill from finishing from it. The relationship is direct: the pin is already the choke structure, which is why an opponent held there is managing a submission threat for the entire time they are underneath it. Every direction they move to escape tightens the strangle.
Two exits from the pin belong here rather than on the position page, because both are decisions made mid-strangle: