Side Triangle

What This Is

The side triangle — yoko sankaku in Japanese — is a triangle choke applied from a lateral position. The attacker is perpendicular to the opponent rather than facing them head-on or foot-to-head. The triangle wraps around the near-side arm and neck from the side angle, with the attacker’s body positioned beside the opponent rather than above or below.

The side triangle is primarily a top position technique — entered from side control, north-south side position, or scramble positions where the attacker is beside the opponent. This is the primary reason perspective is listed as “Top”: the standard application has the attacker controlling from the top position, with gravity and positional weight assisting the finish.

The compression mechanics are the same as all triangle variants (INV-S01 applies), but the finishing hip drive is lateral — to the side — rather than the downward or mat-directed drive of the guard-based triangle variants. The attacker’s body rotation from the lateral position is what closes the choke, and the top position’s weight assists rather than the guard’s ability to elevate the hips.

The side triangle is a high-percentage finishing position once established. The top positional advantage (INV-08 context — positional control increases finishing reliability) combined with the triangle compression means the defender is under simultaneous positional pressure and submission pressure. Escaping requires solving both problems.

Safety First

The Invariable in Action

The bilateral requirement does not change with the lateral approach. The attacker’s thigh and the opponent’s trapped arm against the neck are still the two compression elements. Practitioners who attempt the side triangle as a neck crank — squeezing the leg against the lateral neck — are applying force to one side only and are not applying a blood choke. Confirm both carotids are compressed before treating the position as a finishing threat.

The side triangle’s finishing direction is lateral — the attacker drives their hip away from the opponent’s head (pushing the body sideways) rather than downward. This is the principal mechanical difference from guard-based triangles. Practitioners who apply downward hip drive from the lateral triangle are applying force in the wrong direction for the geometry and reducing compression.

From side control or north-south, the top player’s weight presses down on the opponent while the triangle provides the submission threat. This dual pressure — positional and submission — makes the side triangle difficult to defend. The bottom player must bridge and frame against the positional weight while also defending the choke, dividing their defensive resources.

Entering This Position

From Side Control — Leg Shoot Entry

The primary entry. From standard side control (chest-to-chest, top player beside the opponent), the top player shoots one leg over the opponent’s near arm and positions the triangle around the neck and arm from the side. The near leg comes over the shoulder, the triangle locks with the far leg crossing behind the near knee. The top player remains beside the opponent rather than transitioning to mount or north-south.

From North-South — Lateral Position

From north-south or a 45-degree transition off north-south, the top player rotates to the side and shoots the triangle laterally. This is the most natural entry from the north-south family — the top player is already in a position where the lateral approach is available without significant repositioning.

From Scramble — Top Player Beside the Opponent

When a scramble leaves the attacker beside their opponent — both transitioning from a previous position — the side triangle is available if the arm position is correct. The scramble geometry often produces the lateral approach angle naturally.

Finishing Mechanics

Lateral Hip Drive

The finishing movement is the attacker’s hip driving laterally — away from the opponent’s head, extending the body sideways. This movement closes the triangle from the lateral angle and presses the thigh against the carotid. This is the key mechanical difference from guard triangles: lateral drive rather than downward or away-from-mat drive.

Lock the Triangle Tight

The near foot hooks behind the far knee. From the side position this hook must be tight — the side triangle has a different angle of leg pressure than the guard triangle, and a loose lock is more likely to slip from the side position than from directly above.

Head Control

The opponent’s head must be controlled from the lateral position — preventing them from pulling out of the triangle by turning away from the attacker. The head control in the side triangle is typically a hand on the back of the head or an overhook on the neck rather than the two-hands-behind-the-head of the guard triangle.

Weight Distribution

The top positional advantage means the attacker’s weight assists the finish. Sinking weight into the opponent’s upper body while applying the lateral hip drive combines positional and submission pressure. Do not rise off the opponent to apply the hip drive — the weight must remain.

From This Position

Blood Choke Finish

The primary outcome. With correct lateral hip drive, tight lock, and bilateral compression, the side triangle is a blood choke.

Armbar from Side Triangle

The trapped arm is in armbar range from the lateral position. The pivot to armbar from the side triangle is the same triangle-armbar dilemma as the guard triangle — defending the choke exposes the armbar, and defending the armbar relieves the choke. See: Armbar.

Return to Side Control

If the side triangle fails to close — the opponent frames out or the lock slips — the attacker returns to side control rather than losing the top position. The side triangle is built into the side control game; a failed attempt does not require giving up position.

Defence and Escape

Prevent the Leg-Over-Shoulder Entry

The earliest defence is preventing the leg from going over the near shoulder. From side control bottom, the near arm must be alert to the top player’s leg shooting over it. Keeping the near elbow tight to the body and the arm active prevents the entry.

Roll Into the Attacker

Rolling toward the attacker — into the triangle — can break the lock before it closes. This creates space between the shoulder and the triangle leg, and the bottom player can follow through to a reversal or guard replacement.

Frame Against the Hip

The free arm frames against the attacker’s hip, preventing the lateral drive from closing the triangle fully. Without the lateral drive, the compression is reduced. This requires the free arm to be active throughout — the free arm is the primary defensive tool against the side triangle.

Common Errors — and Why They Fail

Error: Using downward hip drive instead of lateral hip drive. Why it fails: INV-04. The lateral geometry requires lateral force. Downward force from the side position does not close the triangle against the carotid from the correct angle. Correction: The hip drive is sideways — extending the body laterally away from the opponent’s head. Feel the change in pressure on the triangle when the drive direction is correct.

Error: Losing weight distribution while applying the hip drive. Why it fails: Rising off the opponent to execute the lateral drive removes the positional pressure advantage (INV-08). The bottom player can use the space created to escape. Correction: The lateral hip drive must happen while maintaining weight on the opponent’s upper body. The two actions — weight and drive — happen simultaneously.

Error: Loose triangle lock from the lateral position. Why it fails: The side triangle’s angle makes the lock more susceptible to slipping than the guard triangle. A loose near-foot-behind-far-knee lock fails at the first defensive movement. Correction: Set the lock tighter than feels necessary before beginning the lateral drive. The lateral position amplifies the consequences of a loose lock.

Drilling Notes

• Side control to side triangle entry drill. From established side control, practise the leg shoot over the near shoulder and the triangle lock. Goal: smooth entry without losing the weight distribution. Partner offers passive resistance initially. Twenty reps.
• Lateral hip drive calibration. From established side triangle, practise the lateral drive direction with a cooperative partner. Partner confirms whether the pressure is increasing with correct lateral direction vs decreasing with incorrect downward direction. Repeat until the direction is automatic.
• Triangle-armbar dilemma from side. From established side triangle, practise the pivot to armbar as the opponent postures to defend. The pivot direction from the side triangle is mirrored from the guard triangle — confirm the correct pivot direction before adding resistance.

Ability Level Guidance

Also Known As

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