Outside Sankaku — Defending

What This Is

Outside sankaku from underneath — the outside twin of the inside triangle. The attacker has locked their legs in a figure-four around your leg from the outside line.

A closed triangle holds itself, which is what separates this from the ashi positions. The attacker is not spending anything to keep you here, so the usual defensive strategy of outlasting the control does not apply.

The available finishes are outside-line — the outside heel hook, the kneebar, the toe hold. Less catastrophic than their inside equivalents and quite bad enough.

Safety First

Practise this from outside ashi with the triangle as the target, not from a closed one. A partner who starts locked is drilling the half of the position you can do nothing about.

The Two Sides Compared

The same position read from each side. Advantage is one number and it hides most of what matters — the asymmetry worth seeing is in what the position costs each player and how long it lasts.

The key difference: The outside twin of the inside sankaku — a triangle that holds itself.

Low risk and low energy for the attacker is the signature of a closed triangle. It is the same profile as the inside sankaku with a longer clock, and the longer clock is the only thing separating them.

How You End Up Here

Two paths, and one of them does not involve a leg-lock exchange at all — which is why outside positions surprise defenders who only expect them from leg-lock players.

From outside ashi, when the attacker closes the triangle

The window is the moment the free leg travels over. It is the same shape of window as the inside sankaku and it closes just as fast.

From a leg-drag or passing exchange the attacker converted

Outside positions are reachable from passing traffic, so this can arrive without any prior leg-lock exchange.

The Invariant in Action

Outside rather than inside decides which finishes exist, and it is the difference between an outside and an inside heel hook.

Space first, movement second. A locked triangle is built so the space never gets made.

Foot is handle, knee is target — and the kneebar available here attacks the target directly.

Connection held throughout is what prevents extraction, and a triangle holds it without the attacker doing anything. Waiting for a gap waits for something that is not coming.

Escape Mechanics

Deny the triangle

Fight the free leg before it crosses. Every reliable answer to a sankaku of either kind lives here.

Hide the heel and straighten the leg

Outside heel hooks need the heel exposed and the knee bent enough to rotate. A straight, rotated leg with the heel tucked is a much poorer target.

Turn toward the trapped leg

Following the direction of the rotation rather than fighting it takes load off the knee while you work.

Extract along the line of the leg

Once the knee line is contested, straight extraction is the exit. Twisting on the way out feeds the finish.

What Causes Escapes to Fail

Fighting the trapped leg while the free one closes. Same error as the inside sankaku and just as decisive.

Bending the knee to relieve pressure. It feels better and it makes the heel more available.

Assuming outside means safe. It means a longer clock, not a stopped one.

Counter-Offensive Options

Slim. The triangle is self-maintaining, so the attacker is not overextended anywhere obvious. Where a counter exists it is against the entry rather than the position — a free leg travelling across is a leg not defending itself.

Common Errors

Confusing it with outside ashi. Ashi can be lost by the attacker; a locked triangle cannot.

Working on grips. There are no grips to break. The lock is legs.

Late extraction. Extraction works before the triangle, and rarely after.

Drilling Notes

Drill from outside ashi with the partner hunting the triangle. Starting from a closed sankaku drills a position you should have prevented.

Drill the straight-leg heel hide, because the instinct under pressure is to bend and curl.

Ability Level Guidance

Proficient. Outside positions arrive earlier in a grappler’s development than inside ones, so this is often the first locked triangle anyone meets.

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