S-mount armbar

S-mount armbar names the mounted armbar by the position it is most often finished from: the mount with one leg stepped over the opponent’s far arm, so the arm is trapped between the attacker’s legs before any submission is attempted.

Etymology. “S-mount” describes the shape the two bodies make seen from above — the attacker’s body, the opponent’s near side and the opponent’s trapped arm forming a rough S. Pairing it with “armbar” specifies which of the position’s several finishes is meant, because the same configuration also opens the mounted triangle and the kimura, and the choice among the three is made by how the opponent defends.

Mechanics. The value of naming the platform is that the platform does the hard part. From flat mount the attacker has to provoke the exposure and then beat the opponent’s recovery during the descent; from S-mount the leg-over step has already separated the arm from the torso, so only the step over the head and the sit-down remain. That is why the same submission finishes at a higher rate under this name than under the generic one.

Cross-reference. “High mount armbar” names the staging position the entry rides through. Full mechanical coverage on Mounted Armbar, and the platform itself on S-Mount.