In IBJJF the bicep slicer is legal only for adult and masters brown and black belt, gi and no-gi; illegal for every age and belt below adult and masters brown belt. Neck cranks such as the can opener and twister are illegal in every IBJJF division.
Bicep slicer rules
Treat the bicep slicer like other advanced compression locks under IBJJF belt limits.
The IBJJF Technical Fouls & Illegal Moves table — published with the Rule Book on the IBJJF Books and Videos page — makes the bicep slicer legal only for adult and masters brown and black belt, gi and no-gi; illegal for every age and belt below adult and masters brown belt. That holds even if the entry appears from triangle, omoplata, or armbar scrambles.
Official ADCC Championship rules list any arm bar, shoulder lock, or wrist lock as legal, which covers the bicep slicer, so it is legal there. At the ADCC Opens it is illegal in every kids and teen division (under 18); legal for adults and masters. The submission legality matrix has each column. Compression through the upper arm can become dangerous quickly. In training, fold slowly. In IBJJF competition below brown, abandon the illegal finish and move to a legal arm attack or positional score.
Neck crank and spinal lock rules
Can openers and twisters are the common high-intent examples people ask about.
On the IBJJF Illegal Moves table, spinal locks without a choke are illegal in every IBJJF division. That covers can openers and twisters applied as neck or spinal cranks.
Official ADCC Championship rules list the can opener and the twister as allowed. The same page bans neck cranks that trap both shoulders and put downward pressure on the neck. Nearby chokes and truck control can still be useful when the crank itself is banned.
- Can opener: a neck crank from front headlock or turtle, illegal in every IBJJF division
- Twister: a spinal lock from the truck, illegal in every IBJJF division
- ADCC championship rules list both as allowed, with a separate two-shoulder neck-crank ban
- Always separate positional study from illegal finishing pressure
Competition habits that keep you safe
Finish with legal chokes
From front headlock, prioritize guillotine, darce, and anaconda mechanics instead of yanking the head.
Know when compression is allowed
Bicep and calf slicers may be legal later by belt or ruleset. Until then, treat them as awareness topics, not competition weapons.
Key Takeaways
- In IBJJF the bicep slicer is legal only for adult and masters brown and black belt, gi and no-gi; illegal for every age and belt below adult and masters brown belt.
- As neck or spinal cranks, can openers and twisters are illegal in every IBJJF division.
- ADCC championship rules allow those finishes and separately ban some two-shoulder neck cranks; at the ADCC Opens all of them are illegal under 18.
Further Study
IBJJF Books and Videos (Rule Book & Illegal Moves poster)
Official IBJJF Rule Book (v6.1) and Technical Fouls & Illegal Moves downloads. Confirm your age, belt, and gi/no-gi column.
ADCC Rules and Regulations
Official ADCC rules PDF (version of 2026-10-19, linked from adcc-official.com): the legal and illegal techniques lists, and how the Opens modify them.
Submission legality matrix: IBJJF, ADCC, NAGA, Grappling Industries
Bicep slicer, neck crank and twister legality across IBJJF, ADCC Opens, NAGA and Grappling Industries divisions.
Bicep Slicer
Compression lock mechanics and belt-based legality.
Can Opener
Neck crank awareness with safer legal alternatives.
Twister
Spinal lock legality and truck-position context.
Is the twister legal in IBJJF?
Dedicated FAQ on twister rules and truck control.
