Choi Bar

What This Is

The Choi Bar is a shoulder rotation submission. The opponent’s arm is isolated and pulled across their own body — the arm crosses the centreline — while the attacker externally rotates the shoulder against its natural range of motion. It is a shoulder lock, not an elbow hyperextension, which places it in a distinct mechanical category from the standard armbar despite sharing the armbar system hub.

The defining characteristic is the arm crossing the centreline. When the opponent’s arm is pulled across the midpoint of their body and the shoulder is rotated outward, the shoulder capsule and rotator cuff structures are loaded. The Choi Bar exploits a positional exposure that occurs when the opponent’s near arm drifts across their body — in side control, at turtle, or from back control when the seatbelt over-hook isolates the arm.

At proficient level the Choi Bar is learned as a positional read: near arm crossing the centreline equals Choi Bar entry. When that read becomes reflexive, the technique slots into the armbar system chain as a complement to the standard armbar and kimura.

Safety First

The Invariable in Action

The Choi Bar requires the near arm to be isolated — separated from the opponent’s body. If the arm is tucked against the torso or the opponent’s other hand is gripping it, the attacker cannot create the leverage path required to pull it across the centreline. Arm isolation is the first gate. From side control this means controlling the near arm before attempting the rotation; from turtle top it means capturing the posted or drifting arm before the opponent recovers it.

The Choi Bar uses a two-point contact system: one hand controls the wrist and one arm or forearm applies a fulcrum across the shoulder. Both points of contact must be established before the rotational force is applied. A partial connection — wrist controlled but fulcrum not yet set, or fulcrum applied without wrist control — produces neither leverage nor submission. The technique does not begin until both contact points are in place.

The Grip

The Choi Bar grip uses two components working in opposition:

Wrist control: The attacker grips the opponent’s wrist with one hand. The grip is firm and oriented to control the direction of the pull — toward the mat, pulling the arm across the centreline. The wrist is not pulled upward or outward; the pull direction is downward and across.

Shoulder fulcrum: The attacker’s other arm or forearm is placed across the opponent’s shoulder joint — on the posterior or superior shoulder — creating a lever point. The fulcrum does not need to grip; it applies pressure by body weight or positional pressure rather than active squeezing. The attacker uses their body to press the fulcrum into the shoulder while the wrist is pulled in the opposing direction.

Body weight integration: Unlike submissions that rely on arm strength, the Choi Bar is finished with body weight transferred through the fulcrum. The attacker positions their weight so that gravity assists the shoulder pressure rather than fighting against it. This is particularly clear from side control, where the attacker’s chest and upper body are already in a weight-transfer position over the opponent’s shoulder.

The Finish

The finish is a two-direction lever. The wrist is pulled toward the mat while the shoulder fulcrum presses in the opposing direction — toward the mat on the shoulder side. This opposing pressure across the shoulder joint externally rotates the shoulder and loads the rotational structures.

The pull direction matters: The wrist must be pulled across the opponent’s body — not just downward. The arm needs to cross the centreline for the Choi Bar mechanic to activate. A straight downward pull without the crossbody component produces a different (weaker) shoulder stress that is easier to defend.

Rotation, not compression: The mechanism is rotation of the shoulder, not compression of a joint in extension. The attacker should be producing rotation at the shoulder rather than trying to push the arm flat to the mat. The arm going flat is a consequence of the rotation, not the goal of the movement.

Control the elbow: Keeping the opponent’s elbow from bending is important — a bent elbow dissipates the rotational force. Where possible, the attacker keeps the arm at a moderate extension so the rotational force travels cleanly through the shoulder rather than being absorbed by elbow flexion.

Setup and Entry

From Side Control — Near Arm Crossing the Midline

The primary entry. From side control top, the opponent’s near arm drifts across their body — often as they attempt to frame, push, or grip the attacker’s hip or far side. When the arm crosses the centreline, the attacker isolates the wrist, positions their forearm across the opponent’s shoulder as a fulcrum, and applies the rotational lever. The entry reads as: near arm crosses midline → wrist capture → fulcrum placement → finish.

From Turtle Top — Arm Isolated

From the turtle top position, the opponent’s near arm is sometimes extended or posted forward for base. When the arm is not tucked tightly against the body, it can be captured and pulled across the opponent’s body to set the Choi Bar. The attacker needs to control the turtle position stably before isolating the arm — attempting the arm capture while the opponent is actively scrambling leads to losing position rather than setting the submission.

From Back Control — Seatbelt Over-Hook Side

From back control with a seatbelt grip, the over-hook arm is already partially isolated. When the opponent turns into the attacker or when the over-hook deepens, the arm is available for a Choi Bar entry. The attacker releases the seatbelt, captures the wrist with the over-hook arm’s hand, and transitions the under-hook arm to the shoulder fulcrum position. This entry requires timing at a moment of positional transition.

Position Requirements

• Side Control Top — Primary position. Near arm crossing the centreline creates the entry window.
• Turtle Top — Available when the near arm is posted or extended rather than tucked. Requires stable turtle control before the arm capture.
• Back Control (Seatbelt) — Available on the over-hook side. Entry requires a transition moment from the seatbelt grip.

Defence and Escape

Primary defence — keep arms close to the body: The Choi Bar requires the arm to be isolated from the body and pulled across the centreline. An arm that stays in contact with the torso or that is connected across the opponent’s own body (holding their own arm or gi) cannot be pulled into the Choi Bar position. The fundamental defence is not allowing the arm to drift across the midline.

Do not reach across your body: The most common entry for the Choi Bar is an arm that is reaching across the opponent’s own centreline — framing against the attacker’s far hip, grabbing a sleeve or collar, or posting across the body. Avoiding these cross-body arm positions eliminates most Choi Bar entries.

When the grip is set — move the elbow: If the wrist has been captured and the fulcrum is being applied, bending the elbow reduces the rotational force transfer through the shoulder. This is a partial defence — it does not escape the position but reduces the immediate danger while creating time to recover arm position.

When deep — escape the position: Once the Choi Bar is fully set with wrist control and fulcrum established, escaping the submission itself is difficult. The priority becomes escaping the underlying position (side control, turtle, back control) before the finish is applied.

Common Errors

Drilling Notes

• Entry read drill. From side control, partner cooperatively drifts their near arm across the centreline. Attacker practises the reaction: wrist capture, fulcrum placement, light rotational pressure. The drill trains the read — arm crosses midline — rather than the finish.
• Fulcrum placement check. Set the Choi Bar position statically. Partner checks fulcrum placement against the shoulder joint. Adjust until the contact point is at the shoulder, not on the upper arm. Proprioceptive drill.
• Body weight transfer. With the Choi Bar set, practise shifting body weight through the fulcrum arm. Partner gives verbal feedback on when they feel the shoulder pressure increase. Learn to identify the position where body weight is delivering the most effective pressure.
• Direction of pull calibration. Drill the wrist pull direction — across the body toward the far side, not straight down. Use a partner’s coaching to correct the pull direction until the crossbody path becomes automatic.

Ability Level Guidance

Ruleset Context

The Choi Bar is a shoulder rotation lock and is legal in all major no-gi rulesets. Shoulder locks are not restricted by belt level in no-gi competition the way wrist locks may be in some formats. Verify current ruleset versions before competing.

Also Known As

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