What anatomical structures does the Kimura attack when applied from flattened half guard?

The Kimura primarily attacks the shoulder joint through forced internal rotation beyond its normal range of motion. The specific structures at risk are the rotator cuff muscles (supraspinatus, infraspinatus, teres minor, subscapularis), the glenohumeral ligaments that stabilize the shoulder capsule, and the glenoid labrum. Secondary stress is placed on the bicep tendon at its attachment point. The flattened position amplifies these forces because the opponent cannot use hip movement to relieve the rotational pressure on the joint.

What physical and tactile cues indicate the Kimura is approaching the breaking point from this position?

You will feel a progressive increase in resistance as the shoulder approaches its end range, followed by a distinct hardening where the rotation meets bony and ligamentous limits. The opponent's body may involuntarily stiffen or arch. Their breathing pattern changes — often becoming rapid or held. You may feel micro-tremors in their arm as the muscles resist the rotation under load. These cues signal you should hold steady pressure and wait for the tap rather than increasing force, as the joint is at its structural limit.

What control must be established before committing to the Kimura finish from flattened half guard?

Before committing to the finish, you must have chest-to-chest pressure with the opponent's back flat on the mat, secure wrist control on the target arm with the figure-four fully locked and elbows squeezed tight, and the captured elbow pinned against their ribcage with no gap. Your base must be stable with hips low and at least one foot posted wide. Crossface pressure should be maintained through your shoulder even after your hand transitions to the grip. Without all of these elements, the opponent retains defensive options that reduce the finish probability.

At what point during the Kimura from flattened half guard does the submission become effectively inescapable?

The submission reaches the point of no escape once the figure-four grip is fully locked with elbows tight, the captured elbow is pinned to the opponent's ribcage by your chest weight, and the initial rotation has begun painting their hand toward the mat. At this stage, the mechanical advantage of the lever system combined with the restricted mobility of the flattened position means the opponent cannot generate enough force to reverse the rotation or extract their arm. Their only remaining option is to tap before the shoulder reaches its structural limit.

Your opponent clasps both hands together to defend the Kimura grip — what is the correct sequence to break this defense?

First, maintain your figure-four grip and chest pressure without releasing anything. Drive their clasped hands toward the mat using your hip weight rather than pulling with your arms. If the clasp holds, wedge your knee against the outside of their captured elbow to create a lever that separates their grip. You can also attack the weakest point of their clasp by peeling the bottom hand's fingers while maintaining downward pressure. If the grip remains unbreakable, use the stalling opportunity to advance your passing position past the half guard while they are occupied with hand defense.

How should you adjust the figure-four grip if the opponent begins to straighten their captured arm?

When the opponent straightens their arm, maintain your wrist grip firmly and use your chest weight to drive their straightened arm across their body toward the opposite hip. Simultaneously, use your threading arm to lift at their elbow crease while pulling their wrist toward their shoulder with the controlling hand — this re-bends the arm into the Kimura angle. If the arm remains straight, redirect the attack to an Americana by rotating the arm in the opposite direction, as a straight arm with wrist control is vulnerable to this complementary shoulder lock.

Kimura from Flattened Half Guard Attacker | BJJ Submission Guide

SAFETY: Kimura from Flattened Half Guard targets the Shoulder joint, rotator cuff, and shoulder capsule. Risk: Rotator cuff tear (supraspinatus, infraspinatus, teres minor, subscapularis). Release immediately upon tap.

Attacking with the Kimura from flattened half guard top capitalizes on the significant control advantage you have already established. Your chest pressure restricts the opponent’s breathing and movement, creating a platform from which the figure-four grip becomes devastatingly effective. The key insight is that the bottom player must use their arms to survive the flattened position — framing, fighting for underhooks, pushing the crossface — and each of these defensive arm movements creates a window for Kimura grip capture. Your objective is to maintain heavy top pressure while patiently waiting for or forcing the arm exposure, then securing the figure-four and finishing with controlled rotational pressure that the compromised position makes extremely difficult to defend.

From Position: Flattened Half Guard (Top)

Key Attacking Principles

What are the key principles for executing Kimura from Flattened Half Guard?

Maintain chest-to-chest pressure throughout the entire Kimura attack sequence — lifting your weight to finish is the primary reason this submission fails from top position
Capture the wrist before threading the figure-four — premature elbow threading without wrist control allows the opponent to retract the arm
Pin the opponent’s elbow to their ribcage using your chest weight before applying rotation — this removes the space they need to straighten their arm and escape
Use your hips as the primary rotational engine rather than arm strength — hip drive generates far more torque while keeping your base stable
Force the arm exposure rather than waiting passively — swim your hand inside their frame or bait the underhook attempt to create the opening
Treat the Kimura grip as a positional control tool first and submission second — the threat alone can create passing opportunities

Prerequisites

What do you need before attempting Kimura from Flattened Half Guard?

Established chest-to-chest pressure with the opponent’s back flat on the mat and their defensive frames collapsed or compromised
Crossface control or head position that prevents the opponent from turning into you during the grip capture sequence
Identification of the target arm — typically the far arm when the opponent reaches across to fight the crossface or establish an underhook
Stable base with your hips low enough to maintain pressure while your hands transition from positional control to submission grips
The opponent’s trapped leg hook still engaged — if they have already recovered frames, the positional advantage is insufficient for reliable Kimura attacks

Execution Steps

How do you execute Kimura from Flattened Half Guard step by step?

Bait or identify the arm exposure: From your established flattened half guard top position with crossface control, force the opponent to expose their far arm. Swim your hand inside their bicep frame, or slightly reduce crossface pressure to bait them into reaching for the underhook. The moment their arm extends past the safety of their torso centerline, you have your window. (Timing: 1-3 seconds of pressure adjustment to create the opening)
Capture the wrist with your near hand: As the target arm extends, immediately secure their wrist with your crossface-side hand. Grip the wrist firmly with your thumb wrapping around the back of their hand. This initial wrist control is critical — without it, the opponent can retract their arm before you establish the full figure-four. Maintain chest pressure throughout this grip change. (Timing: Immediate reaction within 1 second of arm exposure)
Thread your far arm under their elbow: With the wrist secured, slide your far arm underneath their captured arm at the elbow crease. Thread deeply so your forearm passes completely under their upper arm. Your hand should emerge on the far side of their elbow, reaching toward your own wrist. Keep your chest heavy on their torso — do not lift to create threading space, instead use their arm elevation to thread underneath. (Timing: 1-2 seconds, maintaining constant chest contact)
Lock the figure-four grip: Grip your own wrist with the threading hand, completing the figure-four configuration. Your wrist-controlling hand stays on their wrist while your threading hand locks onto your own wrist from underneath their elbow. Squeeze your elbows tight to your ribs to prevent any slack in the grip. The figure-four should feel like a closed mechanical system with no gaps for the opponent to exploit. (Timing: Immediate connection, less than 1 second)
Pin the elbow and adjust angle: Drive their captured elbow down toward their ribcage using your chest weight and the figure-four grip tension. Their upper arm should be pressed against their side with no space between elbow and body. Shift your hips slightly toward their head side to create a favorable rotational angle. This pinning action removes the space they need to straighten their arm or pull their hand free. (Timing: 2-3 seconds of controlled adjustment)
Initiate controlled internal rotation: Begin rotating their forearm toward their hip using your figure-four grip as a lever. The rotation should come primarily from your hip drive and body positioning rather than arm strength alone. Keep your chest heavy to prevent them from bridging or turning. Paint their hand toward the mat behind their back in a slow arc — never jerk or spike the rotation. The opponent’s shoulder reaches end range and the submission pressure builds progressively. (Timing: 3-5 seconds of smooth, progressive rotation)
Complete the finish with hip pressure: As you feel the shoulder reaching its rotational limit, drive your hips forward while maintaining the rotational angle. This hip drive compounds the submission pressure by adding a compression element to the rotation. The opponent’s arm is now trapped between your figure-four grip and their own body, with your weight preventing any escape movement. Hold steady pressure and wait for the tap rather than forcing additional rotation past the breaking point. (Timing: Hold finishing pressure until tap — never rush past resistance)

Possible Outcomes

Result	Position	Probability
Success	game-over	62%
Failure	Flattened Half Guard	25%
Counter	Half Guard	13%

Opponent Defenses

How might your opponent defend against Kimura from Flattened Half Guard?

Opponent clasps hands together or grabs their own belt to prevent arm isolation (Effectiveness: High) - Your Response: Maintain the figure-four grip and drive their clasped hands toward the mat using hip pressure. Alternatively, wedge your knee against their elbow to create separation, or peel their grip by attacking the weakest fingers. If the grip holds, use the stalling as an opportunity to advance position past the half guard. → Leads to Flattened Half Guard
Opponent straightens the captured arm to remove the figure-four leverage angle (Effectiveness: Medium) - Your Response: Keep the wrist grip and use your chest to drive their straightened arm across their body. A straight arm is actually vulnerable to the Americana if you redirect the rotation. Alternatively, re-bend their arm by lifting their elbow with your threading arm while pulling their wrist toward their shoulder. → Leads to Flattened Half Guard
Opponent bridges explosively and turns into you to create space and recover guard (Effectiveness: Medium) - Your Response: Maintain the figure-four grip throughout the bridge. Post your far foot wide to absorb the bridge energy without being rolled. As they settle back to the mat after the failed bridge, immediately tighten the grip and resume the rotational finish while they are fatigued from the effort. → Leads to Flattened Half Guard
Opponent hip escapes to create an angle that relieves rotational pressure on the shoulder (Effectiveness: Medium) - Your Response: Follow their hip movement by adjusting your own hip position to maintain the perpendicular angle needed for the Kimura. If they create significant space, transition to the Kimura Trap position by stepping over their head, which actually improves your finishing angle and eliminates their escape direction. → Leads to Half Guard

Common Attacking Mistakes

What mistakes should you avoid when executing Kimura from Flattened Half Guard?

1. Lifting chest off the opponent to create space for the figure-four threading

Consequence: Removes the primary control advantage of the flattened position, allowing the opponent to immediately recover frames, insert knee shield, or escape the half guard entirely
Correction: Thread the figure-four using the existing space created by the opponent’s arm elevation — your chest stays glued to their torso throughout the entire grip establishment sequence

2. Attempting to finish with arm strength alone rather than using hip rotation and body weight

Consequence: Burns grip and arm endurance quickly, produces inconsistent finishing pressure, and allows stronger opponents to resist the rotation through muscular defense
Correction: Drive the finish through hip rotation and forward pressure — your arms maintain the grip structure while your hips and body weight generate the rotational torque needed to overcome shoulder resistance

3. Attacking the near arm instead of the far arm from crossface position

Consequence: The near arm is protected by your own body position and the opponent can easily retract it beneath your chest — this also sacrifices crossface control for a low-percentage grip attempt
Correction: Target the far arm that extends past the opponent’s centerline when they reach for frames or underhooks — this arm is mechanically isolated from their defensive structure

4. Releasing crossface control prematurely before establishing secure figure-four grip

Consequence: Allows the opponent to turn their head toward the action, use their near arm for framing, and create the defensive angles needed to prevent the Kimura finish
Correction: Maintain crossface pressure with your shoulder and head position while transitioning your hand to the wrist grip — the crossface transfers from hand control to shoulder-driven control during the grip change

5. Jerking or spiking the rotational finish instead of applying progressive pressure

Consequence: Creates serious injury risk to training partners, does not allow time for the tap, and in competition can result in disqualification for dangerous technique application
Correction: Apply rotation in a smooth, progressive arc over 3-5 seconds minimum — feel for the endpoint of shoulder range and hold steady pressure rather than forcing past resistance

6. Leaving slack in the figure-four grip with elbows flared away from your body

Consequence: Creates space for the opponent to extract their arm, straighten the elbow, or rotate their shoulder to relieve pressure — the submission becomes a control position rather than a finishing threat
Correction: Squeeze your elbows tight against your ribs when locking the figure-four — the grip should function as a closed mechanical system with zero slack between your arms and their captured limb

Training Progressions

How do you train Kimura from Flattened Half Guard (Attacker)?

Phase 1: Grip Mechanics - Figure-four capture from top pressure Practice the wrist capture to figure-four threading sequence with a compliant partner from flattened half guard top. Focus on maintaining chest pressure while transitioning grips. Drill 20 repetitions per side, emphasizing smooth threading without lifting your weight.

Phase 2: Finishing Mechanics - Hip-driven rotation and progressive pressure With the figure-four already established, practice the finishing rotation using hip drive rather than arm strength. Partner provides light resistance to simulate proper pressure application. Focus on smooth, controlled arcs and identifying the tap window. Build awareness of shoulder end-range indicators.

Phase 3: Counter Management - Defeating common defensive responses Partner applies specific defenses — hand clasping, arm straightening, bridging, hip escaping — and you practice the appropriate counter for each. Rotate through all four defenses in sequence, building reaction patterns. Increase partner resistance gradually across sessions.

Phase 4: Live Integration - Applying the complete Kimura sequence against progressive resistance Begin from flattened half guard top with partner at 50% resistance, increasing to 80% over multiple rounds. Practice identifying the arm exposure window, capturing the grip, defeating the defense, and completing the finish. Include transitions to Kimura Trap and positional advancement when the finish is not available.

Phase 5: Situational Sparring - Full-speed positional rounds starting from flattened half guard Three-minute rounds starting from flattened half guard with the Kimura as the primary attack objective. Full resistance from both players. Track finish rate, time to grip capture, and defensive responses encountered. Develop the ability to chain the Kimura threat with passing sequences.

Kimura from Flattened Half Guard Attacker

Outcomes