Gi & no-gi Advanced
John Danaher on the entries into the rear-triangle back position, so you are not hunting the lock from a sloppy seatbelt.
Submissions
Locking a triangle around the neck and one arm from back control when the opponent defends the rear naked choke.
Also called triangle from the back, back triangle, ushiro sankaku.
3 resources
John Danaher on the entries into the rear-triangle back position, so you are not hunting the lock from a sloppy seatbelt.
Jordan Preisenger's tight triangle from the back, a shorter clip if Kesting's full tutorial is more than you need.
Stephan Kesting's rear triangle (ura sankaku) from the back when the opponent tucks their chin against the rear naked choke.