Under the shoulder choke

Under the shoulder choke is a colloquial name for the kata gatame bottom position — “shoulder choke” being the everyday name for the arm triangle the bottom player is defending.

Etymology. “Shoulder choke” names the arm triangle by the shoulder that supplies one side of the pressure; “under the” frames the defending player. The label is informal, used where “kata gatame” is unfamiliar.

Mechanics. Escaping requires destabilising the top player’s control before the choke tightens: bridging and turning unsettles the head-and-arm pin and creates the angle to recover, since a settled, heavy top position completes the strangle while an off-balanced one cannot keep both sides of the neck compressed.

Cross-reference. “Head and arm pin bottom” and “Arm triangle defence from bottom” are sibling aliases. Full mechanical coverage on Kata Gatame — Bottom.