Can Opener
Neck crank from front headlock or turtle that pulls the head toward the chest without a true choke — illegal under IBJJF when applied as a spinal/neck crank without strangulation.
The can opener typically starts from a front headlock or top turtle position: the attacker clasps behind the head and pulls the skull toward the chest, stressing the neck without securing a blood choke. Under IBJJF rules, neck cranks and spinal locks of this type are illegal when they are not legitimate chokes. This page documents the mechanics and rule status so athletes can recognize the position, avoid illegal finishes in IBJJF, and choose legal front-headlock attacks instead.
- From front headlock or top turtle, get both hands clasped behind the head.
- Sprawl or settle hips so their posture cannot rise.
- Keep your chest and shoulders heavy to limit their frames.
- Pull the head toward your chest while driving hips and shoulders forward.
- The pressure loads the cervical spine rather than compressing the carotids cleanly.
- Stop immediately on tap — neck cranks can injure before a clear choke signal.
- In allowed rulesets, apply gradual pressure only with clear communication.
- If a legitimate guillotine or front-headlock choke is available, prefer the blood choke.
- In IBJJF, abandon the crank and switch to legal chokes or positional advancement.
Safety Warning
- Neck
- Cervical spine
- Can opener is a crank, not a high-percentage blood choke.
- IBJJF legality fails when the attack is a spinal/neck crank without strangulation.
- Front headlock should funnel into legal choke families in sport BJJ.
- Front headlock after a sprawl or snap-down.
- Top turtle when they hide the neck but leave the head available.
- Scrambles where both hands clasp behind the head before a choke is set.
- Tuck the chin and hand-fight the clasp before the pull starts.
- Sit out or roll to clear front headlock pressure.
- Expect the attacker to switch to a guillotine — defend the choke path as well.
- Guillotine when the neck wrap becomes a real strangle.
- D’arce or anaconda when an arm is trapped with the head.
- Back take when they turn away from front headlock pressure.
- Front-headlock control rounds that only allow legal choke finishes
- Recognition drills: identify crank vs choke pressure with a coach
- Snap-down to guillotine chains without head-yank finishes
The can opener cranks the neck from front headlock or turtle and is illegal under IBJJF when used as a spinal/neck crank without a true choke. Recognize it, train safer legal finishes from the same control, and never yank heads in IBJJF competition.