Bicep slicers are brown and black belt only in IBJJF, while neck cranks such as the can opener and twister are listed as illegal.
Treat the bicep slicer like other advanced compression locks under IBJJF belt limits.
Open BJJ lists the bicep slicer as legal for brown and black belts in IBJJF, legal in ADCC, and legal in MMA. That means the finish is off-limits for white, blue, and purple IBJJF competitors even if the entry appears from triangle, omoplata, or armbar scrambles.
Compression through the upper arm can become dangerous quickly. In training, fold slowly and keep clear tapping habits. In competition, abandon the illegal finish and move to a legal arm attack or positional score.
Can openers and twisters are the common high-intent examples people ask about.
Open BJJ lists the can opener as illegal in IBJJF, restricted in ADCC, and legal in MMA. The same pattern applies to the twister: illegal in IBJJF, restricted in ADCC, and legal in MMA.
These finishes apply rotational or cranking pressure to the neck and spine. Many rulesets ban them even when nearby chokes or truck control remain useful.
- Can opener: illegal IBJJF neck crank from front headlock or turtle
- Twister: illegal IBJJF spinal lock from the truck
- Front headlock and truck control can still lead to legal exits
- Always separate positional study from illegal finishing pressure
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
- Open BJJ lists bicep slicers as IBJJF legal for brown and black belts only.
- Can openers and twisters are listed as IBJJF illegal neck/spinal cranks.
- ADCC and MMA treat these attacks differently, so event rules always win.
Further Study
Compression lock mechanics and belt-based legality.
Neck crank awareness with safer legal alternatives.
