Bottom of 100-kilo position

Bottom of 100-kilo position is the judo-derived name for the defender’s perspective under the north-south pin — the bottom configuration in which the attacker lies chest-to-chest above the head with their body rotated 180 degrees relative to the defender, in the position judo formally calls kami shiho gatame.

Etymology. “100-kilo position” is grappling vocabulary for the north-south pin, originating in judo training where the position’s compressive effect on a defender often felt like being trapped under a 100-kilogram weight regardless of the attacker’s actual mass. “Bottom of” specifies the defender’s perspective, parallel to “pinned in kesa” and “bottom of knee ride.” The descriptive label entered submission grappling vocabulary through judo cross-training and remains in active use as informal naming for the position’s bottom side.

Mechanics. From the bottom-position perspective, the attacker’s chest-and-shoulders coverage over the defender’s chest restricts the defender’s breathing and frame generation. The 180-degree rotation between the bodies means the defender’s hand-fighting options are positioned at their own hips rather than the attacker’s, limiting the offensive frame work that bottom side-control would allow. Escape requires bridging to disrupt the chest contact or rotating out from underneath before the attacker secures the north-south choke or transitions to mount.

Cross-reference. English-speaking no-gi uses “north-south bottom” or “100-kilo bottom.” Full mechanical coverage on North-South Bottom.