Mounted Triangle

What This Is

The mounted triangle applies the triangle choke from the top position — the attacker is above the opponent, with their legs forming a triangle around the opponent’s neck and one arm from a top-down angle. The same bilateral carotid compression that the standard guard triangle creates is achieved from the inverted perspective: one carotid is compressed by the inner thigh, the other by the opponent’s own shoulder being pushed inward by the triangle’s locked leg.

The mounted triangle is primarily an output from S-mount and high mount. When the opponent is in S-mount with one arm isolated, the attacker can swing the free leg over the opponent’s neck and lock it behind the knee of the leg that is trapping the arm — completing a triangle from above. The trapped arm is now inside the triangle, and the triangle’s compression mechanism applies in the same way as from guard, just from above.

The position solves a common problem in high-level mount — the opponent who defends the armbar by bending their arm and pulling it toward their body also brings their shoulder up. The mounted triangle captures that rising shoulder. The opponent’s armbar defence becomes the mounted triangle entry.

Unlike the guard triangle, the mounted triangle does not require hip elevation to finish — gravity and the top player’s weight create the downward pressure. The opponent cannot simply posture up to relieve the pressure as they might do against a guard triangle. The top position weight advantage makes the mounted triangle a reliable finish once it is locked.

The Invariable in Action

The mounted triangle’s bilateral compression mechanism is identical to the guard triangle: one inner thigh compresses one carotid, the opponent’s own shoulder (pushed inward by the triangle’s locked leg) compresses the other. The difference is the direction of application — from above rather than from below — but the two-sided compression requirement does not change. A triangle that covers the neck but leaves one carotid uncompressed does not produce the submission.

The mounted triangle requires exactly one arm inside the triangle: the arm that was being isolated in S-mount or being attacked from high mount. If both arms are inside the triangle, neither carotid is compressed (the arms act as a barrier). If neither arm is inside, the triangle sits around the neck with no trapped shoulder to create the second side of the compression. The arm isolation from S-mount pre-solves this requirement — the arm that was trapped by the leg step-over is the arm that goes inside the triangle.

Entering This Position

From S-Mount — Leg Swing Over

The primary entry. From S-mount with the arm trapped between the legs, the attacker swings the free leg over the opponent’s neck and locks it behind the knee of the arm-trapping leg. The triangle is now formed: one leg over the neck, the second leg behind the first leg’s knee, and the trapped arm inside. The attacker’s weight is forward, pressing the triangle down toward the opponent’s face. The submission can be finished immediately or adjusted for angle and depth.

From High Mount — When Opponent Brings Shoulder Up

From high mount (knees near the armpits), when the opponent bridges or brings one shoulder up — whether to escape or to defend an armbar attempt — that rising shoulder creates the triangle entry. The attacker swings a leg over the rising shoulder, catches the neck between the legs, and locks the triangle. The entry must be fast — the window when the shoulder is elevated is brief.

From Knee on Belly — Step Over

From knee on belly (POS-TOP-KOB) with the near arm controlled, the attacker can step the near leg over the opponent’s arm and neck to lock a mounted triangle. The knee on belly angle positions the attacker partially perpendicular to the opponent, which is the correct body orientation for the mounted triangle. The step-over from KOB is faster than from flat mount because the perpendicular angle is already present.

The Finish

The mounted triangle is finished by closing the triangle tightly and adding downward weight:

Closing the triangle: The leg that is over the neck locks behind the knee of the other leg. Pull the locked heel toward the body to tighten the triangle. The tighter the triangle, the less additional weight is needed to produce the compression.

Angle adjustment: The triangle works best when the attacker’s body is at approximately 90 degrees to the opponent — the locked leg cutting across the neck perpendicularly. If the attacker is parallel to the opponent (lying straight), the triangle loses compression efficiency. Adjust the hip angle before tightening.

Driving the trapped arm across: Pushing the trapped arm across the opponent’s body (toward their other shoulder) increases the pressure of the trapped shoulder against the carotid. The attacker uses their hands to control the trapped arm and drive it across during the finish.

Weight drop: Unlike the guard triangle, the mounted triangle can use gravity by allowing the hips to drop down toward the opponent’s head. This creates additional downward pressure through the triangle that the opponent cannot bridge into. Dropping the weight is the finishing mechanism when triangle tightness alone is insufficient.

From This Position

Armbar (SUB-ARM-ARMBAR)

When the opponent pushes up with their trapped arm to escape the triangle, the straightening arm can be attacked with an armbar. The attacker controls the wrist of the trapped arm and transitions from the triangle to an armbar as the arm extends. This is the mounted triangle’s version of the guard triangle-to-armbar transition — the opponent’s defensive response creates the next submission.

Maintain and Finish

Unlike the guard triangle, the mounted triangle does not have a clear escape via posturing up. The opponent who is mounted cannot generate the upward force needed to relieve triangle pressure the way a standing opponent could. The mounted triangle, once locked correctly, is primarily a submission-to-finish rather than a position-to-transition.

Defence and Escape

Prevention — keep one arm outside and one arm inside at all times: The standard mounted position defence — elbows tight to the body — prevents the arm from being isolated in the S-mount position that creates the triangle entry. Preventing S-mount prevents the mounted triangle.

Fight the leg crossing the neck: When the attacker’s leg swings toward the neck, the defender should block the leg with their free hand or turn away. Stopping the leg before it crosses the neck prevents the triangle from forming.

Posture into the triangle: The mounted triangle is not as easily alleviated by posturing as the guard triangle, but driving the chin into the chest and turning the head toward the trapped arm reduces the compression efficiency. This is a stalling defence rather than an escape — the mounted triangle must be escaped via positional movement, not just head position.

Roll and create space: The primary mounted triangle escape is to roll toward the trapped arm side, creating enough space to pull the trapped arm out and break the triangle’s arm-inside configuration. This is a difficult escape against a locked triangle — prevention is significantly easier than escape.

Common Errors

Drilling Notes

Systematic Approach

Phase 1 — Entry from S-mount (cooperative). From S-mount with arm trapped, practise the leg swing over the neck and the triangle lock. Confirm: one arm inside, leg at 90 degrees, triangle closed. Ten reps. No finishing force yet.

Phase 2 — Angle and arm position (cooperative). From the locked mounted triangle, practise the hip angle adjustment and the trapped arm drive. Partner gives feedback on where the triangle pressure is felt. Confirm it is the carotids, not the throat. Adjust until the compression is correct.

Phase 3 — Three-way decision from S-mount. From S-mount, partner defends: (a) arm stays straight — armbar; (b) arm bends, shoulder rises — mounted triangle; (c) arm bends, shoulder stays down — kimura. React to the partner’s response. This builds the connected system from S-mount.

Ability Level Guidance

Also Known As

Related Pages

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