Submissions
Pulling the head forward from inside closed guard to force the guard open. A neck crank that is illegal in many rule sets.
Also called neck crank from closed guard, can opener neck crank.
2 resources
Peter Mettler Martial Arts YouTube
A clear demonstration of the can-opener neck crank from inside closed guard, with a reminder that it is illegal in many gi rule sets.
Wim Deputter BJJ YouTube
Wim Deputter treats the can opener as a closed-guard opener rather than a cheap crank, including when it is legal and how the bottom player should respond.