Guillotines, triangles, and arm-triangle chokes are three separate submissions that all cut blood flow to the brain through the neck, but each uses different limbs and a different position to do it. A guillotine is applied face-to-face with an arm wrapped around the front of the neck. A triangle is applied with the legs, from underneath an opponent. An arm-triangle is applied with an arm and shoulder, from on top. Fighters and commentators use the names precisely because the setups, the positions, and the escapes are all different.
What the three chokes have in common
All three are blood chokes, meaning they work by compressing the carotid arteries — the vessels on either side of the neck carrying oxygenated blood to the brain — rather than crushing the windpipe. A properly applied blood choke can render someone unconscious in seconds, which is why a fighter caught in one only has two options: tap to signal submission, or hold on until they black out and the referee stops the fight.
Where they differ is everything else: which limbs apply the pressure, which fighter is on top, and what mistake usually leads to each one landing.
The guillotine: face-to-face, applied from the front
A guillotine choke is applied when one fighter wraps an arm around the front of an opponent's neck while facing them, then squeezes the head against their own chest or ribs to finish the choke. It can be applied standing, in the process of stopping a takedown, or on the ground with the attacking fighter's legs often wrapped around the opponent's body for control.
The classic setup is a botched takedown attempt: a fighter shoots forward and drops their head too low or too far in front of their opponent, and the opponent traps that exposed neck on the way down. That's why the guillotine is sometimes described as a "counter" to a takedown rather than an attack a fighter goes looking for from a neutral position — it punishes an opponent who leads with their head. There are variations on the grip — some fighters trap the opponent's arm inside the choke along with the neck, others take a cleaner grip around the neck alone — but the shared mechanics are the same: an arm across the front of the throat, squeezed tight from a face-to-face position.
The triangle: applied with the legs, from the bottom
A triangle choke is applied entirely with the legs, by a fighter who is usually flat on their back, working from a position called guard — controlling an opponent between their own legs. To lock it in, the attacking fighter traps one of the opponent's arms and their head between their thighs, crosses their ankles behind the opponent's own leg or knee, and squeezes their legs together in a figure-four shape that looks roughly triangular, which is where the name comes from.
The choke works because one of the opponent's own shoulders becomes part of the trap: with one arm inside the leg triangle and one arm outside it, the trapped shoulder presses into one side of the neck while the attacking fighter's leg presses into the other, pinching the carotid arteries between the two. It's the only one of these three chokes applied from underneath an opponent rather than from a dominant top position, which is part of why it surprises fighters who assume being on bottom means being in trouble.
The arm-triangle: an arm and shoulder, applied from on top
An arm-triangle choke looks similar to a guillotine on a broadcast graphic, but it's a different technique applied from a completely different position. The attacking fighter is on top — usually in side control or mount, positions where they're pinning the opponent's upper body from the side or straddling their torso — and traps one of the opponent's arms across their own neck. The attacker then wraps an arm around the far side of the opponent's head and locks their own hands together, squeezing the opponent's head and trapped arm against their own shoulder and chest.
The trapped arm is what gives the choke its name and its danger: with one of the opponent's own limbs jammed against their neck, the pressure comes from the attacker's shoulder on one side and the trapped arm and shoulder on the other, closing off blood flow on both sides at once. It's commonly set up when a fighter is passing from side control toward mount and catches a stray arm on the way, or when an opponent gives up their neck trying to shrimp or turn away from bottom.
Telling them apart when you're watching
Position is the fastest way to identify which choke is developing. If both fighters are facing each other and one arm is wrapped around the front of the neck, standing or on the ground, that's a guillotine. If the fighter applying the choke is underneath, with their legs locked around the opponent's neck and one arm, that's a triangle. If the fighter applying the choke is on top, in side control or mount, with an arm wrapped around the head and the opponent's own arm trapped against their neck, that's an arm-triangle.
A real example: at UFC 330, Jeremiah Wells finished Myktybek Orolbai with a guillotine after a scramble put Orolbai's neck across Wells's arm. On a different card, Abdul Hussein finished Cody Gibson with an arm-triangle from top position in the third round — a clean illustration of the top-position setup, distinct from a guillotine even though both end with an arm across the neck. For how a fighter ends up on the wrong end of a hold like this in the first place, see ground positions, explained.
The takeaway
All three chokes end a fight the same way — by cutting blood to the brain until a fighter taps or goes unconscious — but they get there through different limbs and different positions: a guillotine from the front with an arm, a triangle from underneath with the legs, and an arm-triangle from on top with an arm and shoulder working together. Once you know which fighter is on top and which limb is doing the squeezing, you can name the choke correctly before the commentary team does, and you'll understand exactly why the fighter caught in it has no good way out.