Also known as: High Mount Armbar · Spinning Armbar (adjacent)
From the S-mount the armbar is already 80% finished: the arm is isolated, your knee is behind their head — swing the leg over and sit back onto a waiting elbow.
Submission · Armlock · Gi & No-gi · Difficulty 3/5 · Usually learned at Blue belt
Starts from S-Mount as the s-mount player → ends the match (submission).
The details that make it work
Hug the target arm at the elbow, trapping it to your chest before any leg moves.
The leg over the face stays HEAVY — shin across the jawline, never floating above it.
Sit back onto your hip, knees pinched; extend gradually with their thumb pointing up.
Where it goes wrong
Leaning back for the finish before the face-side leg is over, opening the escape hatch.
How opponents counter it
Lock the hands and stack before the sit-back
Hitchhiker rotation as extension begins
Is the S-Mount Armbar legal in competition?
Legal in all major rulesets at all levels (IBJJF, ADCC, sub-only). Rules change — always confirm against the current official rulebook for your event.