Closed Guard Intermediate · Gi and no-gi

The omoplata is a kimura done with the leg

The omoplata applies the kimura's shoulder rotation with your leg instead of your arms, which is why it locks when your hips stay low and fails as a sweep when they rise.

Position and problem

You have their arm trapped under your leg from closed guard, you swing the leg over their shoulder and sit up, and the omoplata from guard is on. Either your hips come up as you sit, their trapped shoulder gets room to move, and they roll forward over it and land beside you with the arm free. Or you keep the leg tight and they simply stay on their knees, posture upright, and the arm that should be locking hangs there doing nothing. Both feel like the omoplata failing. Both are the same mechanic misapplied, because the lock lives in the shoulder. The shoulder is only loaded when your thigh lies across the back of it, their elbow is bent behind them, and their torso is stopped from following the arm.

Objective

Rotate the trapped shoulder with your leg while your hips stay on the mat and your arm holds their far hip, so the lock finishes, the sweep works, and the roll has nowhere to go.

Core concept

The omoplata is the kimura's shoulder rotation applied by your leg instead of your arms. In both, the elbow is bent, the hand is driven up behind the back, and the upper arm is rotated in the shoulder while the torso is stopped from following it. In the kimura the figure-four grip supplies the rotation and your body stops the torso; in the omoplata your thigh across the back of the shoulder supplies it and your arm across their hip stops the torso. That trade makes the omoplata stronger and slower at once, because a leg carries more than two arms and also has further to travel to get there. Hip height follows from the same trade. The leg can only push what the hips are anchored against, so an omoplata with your hips low and turned toward their legs drives the shoulder forward and tips them over, which is the omoplata sweep. The same shape with your hips high leaves your leg hanging on their shoulder with nothing behind it, and from there they stand, stack you or roll. The roll is the standard omoplata escape, along with posturing up before the hip is controlled, and both work only while their hip is free. A forward roll over the trapped shoulder takes the torso with the arm, which is the one thing the lock has to prevent. The arm across their far hip is the part of the omoplata that makes the rest of it a lock. Stop the hip and the roll has nowhere to go; miss it and nothing else holds the lock.

Key mechanics

Trap the arm bent before the leg goes over. The lock is a rotation of a bent arm, so an arm that has already straightened along your body has nothing for the leg to turn.
Bring the leg over the shoulder with the knee bent and the foot pointed across their back, then pinch the knee down. A straight leg lying on the shoulder blade is a weight; a bent one is a hook on the upper arm.
Sit up and turn toward their legs, keeping your hips on the mat. Low hips give the leg a base to drive from, and the turn moves the shoulder forward instead of pulling it toward you.
Block their far hip with your arm before you apply anything. The torso following the arm is the escape, and the hip block is what stops the torso.
Apply the finish by moving your hips forward and down over the shoulder, never by yanking the wrist with your hands. The rotation comes from the leg driving the shoulder, and the hands only keep the wrist from sliding out.
Sweep by continuing the same drive when they refuse to flatten. With hips low and the far hip blocked, driving the shoulder toward the mat tips them onto their back, and you sit through into top position.
If they begin to roll before the hip is blocked, follow the roll instead of holding the leg. A roll you travel with ends in side control or a re-applied lock; a roll fought against ends with their arm free and your leg pinned under them.

Common errors

Sitting up with the hips lifted off the mat, which unloads the shoulder and leaves the leg hanging on it while they posture up or roll.
Letting the trapped arm straighten before the leg is over, so the leg rotates nothing and the arm slides out along your body.
Leaving the far hip free while applying the lock, which turns the finish into a forward roll for them and a lost position for you.
Pulling on the wrist with both hands to finish, which tires the arms, tells them where the lock is and does less than the hips do by moving an inch.
Holding the leg tight through a roll they have already started, so the roll ends with your leg pinned under their back and the escape complete.

Safety

The omoplata loads the shoulder of the person underneath the leg, in the same direction the kimura loads it, with the weight of your hip behind it instead of two arms. The elbow is bent and the upper arm is rotated in the socket. Because the leg is far stronger than the joint it is turning, the lock can reach the end of the shoulder's travel quickly. Apply it by moving your hips a small amount at a time and stop when the shoulder is loaded, not when the partner is flat. When you are the one caught, tap to a loaded shoulder rather than trying a late roll. A forward roll begun after the hip is blocked and the shoulder is loaded forces the rotation through the joint on the way over. Both partners also watch the trapped wrist, which is held against the leg and can be bent back if the sweep is driven while the hand is stuck.

Training progression

Static: from closed guard, partner places one arm along your hip and holds still. Trap it bent, bring the leg over, sit up with hips on the mat and block the far hip. Stop before any pressure.
Cooperative: partner lets you set the position, then slowly tries to posture up. Notice how far your hips can rise before the shoulder unloads and the posture returns.
Cooperative roll: partner performs a slow forward roll each repetition. Practise following the roll into side control, then practise stopping it with the hip block, one per repetition.
Constrained game: you may only omoplata; partner may only defend by rolling or standing, never by pulling the arm out. Score for a lock, a sweep or a follow to top.
Positional sparring: closed guard, the top player's arm starts on your hip, full resistance from the entry onward. Restart on a finish, a sweep or an escape to a pass.
Live rounds, noting afterwards whether each omoplata was lost at the arm, at the hip height or at the hip block.