Hiza Gatame.

What it is

Elbow lock using the knee as a fulcrum on a trapped straight arm

What you do

TAP URGENCY: MODERATE—the elbow reaches its limit with very little movement once locked

Sharp pain in the elbow crease is the warning sign; release at the tap, do not hold

Apply weight progressively through the knee rather than dropping it onto the joint

Stop pressure if the opponent's arm is still bent—forcing extension risks tearing tissue

Drill the wrist clamp and knee placement cold before adding any finishing pressure