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.
The Kimura from flattened half guard top is a high-percentage shoulder lock that exploits the positional dominance achieved when you collapse your opponent’s defensive structure. Unlike Kimura attacks from neutral positions where the defender retains significant mobility, this variation benefits from sustained chest pressure that restricts the defender’s breathing, hip movement, and standard defensive responses. The attack typically presents when the bottom player extends an arm to establish frames, fight for an underhook, or push against the crossface — necessary survival actions that simultaneously expose the arm to figure-four grip capture.
The defining strategic advantage is the compounding pressure dilemma. Your chest weight restricts the opponent’s movement while the Kimura grip creates a secondary threat forcing them to choose between defending the submission and recovering positional frames. When they defend the Kimura by clasping hands or gripping their belt, they abandon frame recovery efforts, allowing you to settle deeper into the flattened position or advance to side control. When they prioritize positional escape, the arm becomes increasingly vulnerable to the shoulder lock. This two-pronged problem is central to why this variation finishes at higher rates than Kimura attacks from more neutral positions.
The finishing mechanics differ from standard Kimura applications because the flattened position eliminates several common defenses. The bridge-and-roll escape is compromised by your weight distribution, hip escaping to create defensive angles is limited by chest pressure, and hiding the hand becomes difficult when the defender needs that arm for positional survival. Understanding these positional advantages allows you to apply the Kimura with controlled precision rather than relying on brute rotational force, making this one of the most reliable shoulder lock finishes available from top position.
Category: Joint Lock Type: Shoulder Lock Target Area: Shoulder joint, rotator cuff, and shoulder capsule Starting Position: Flattened Half Guard From Position: Flattened Half Guard (Top) Success Rate: 62%
Safety Guide
Injury Risks:
| Injury | Severity | Recovery Time |
|---|---|---|
| Rotator cuff tear (supraspinatus, infraspinatus, teres minor, subscapularis) | High | 3-9 months with potential surgery requirement |
| Shoulder capsule damage and dislocation | CRITICAL | 6-12 months, may require surgical repair |
| Labral tear (glenoid labrum) | High | 4-8 months, often requires arthroscopic surgery |
| Bicep tendon strain or rupture | Medium | 6-12 weeks for strain, 3-6 months for rupture |
Application Speed: SLOW and progressive - 3-5 seconds minimum in training, allowing partner time to recognize danger and tap
Tap Signals:
- Verbal tap (saying ‘tap’ or making any verbal distress sound)
- Physical hand tap (multiple taps with free hand)
- Physical foot tap (multiple taps with either foot)
- Any distress signal including screaming or unusual sounds
Release Protocol:
- Immediately stop all rotational pressure the instant tap is felt or heard
- Return the arm toward neutral position (externally rotate back to starting position)
- Release the figure-four grip completely
- Allow partner to self-assess shoulder mobility before continuing
- Never release suddenly or allow arm to spring back forcefully
Training Restrictions:
- Never spike or jerk the submission - rotation must be smooth and controlled
- Never use competition speed or surprise attacks in training
- Always ensure partner has at least one hand free to tap
- Do not apply while partner is in awkward body position that prevents tapping
- Never combine with weight pressure that restricts breathing while finishing
- Respect immediate taps without testing partner’s pain tolerance
Outcomes
| Result | Position | Probability |
|---|---|---|
| Success | game-over | 62% |
| Failure | Flattened Half Guard | 25% |
| Counter | Half Guard | 13% |
Attacker vs Defender
| Attacker | Defender | |
|---|---|---|
| Focus | Execute and finish | Escape and survive |
| Key Principles | Maintain chest-to-chest pressure throughout the entire Kimur… | Prevention over escape — deny the initial wrist capture by k… |
| Options | 7 execution steps | 4 defensive options |
Playing as Attacker
Key Principles
-
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
Execution Steps
-
Bait or identify the arm exposure: From your established flattened half guard top position with crossface control, force the opponent t…
-
Capture the wrist with your near hand: As the target arm extends, immediately secure their wrist with your crossface-side hand. Grip the wr…
-
Thread your far arm under their elbow: With the wrist secured, slide your far arm underneath their captured arm at the elbow crease. Thread…
-
Lock the figure-four grip: Grip your own wrist with the threading hand, completing the figure-four configuration. Your wrist-co…
-
Pin the elbow and adjust angle: Drive their captured elbow down toward their ribcage using your chest weight and the figure-four gri…
-
Initiate controlled internal rotation: Begin rotating their forearm toward their hip using your figure-four grip as a lever. The rotation s…
-
Complete the finish with hip pressure: As you feel the shoulder reaching its rotational limit, drive your hips forward while maintaining th…
Common Mistakes
-
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
-
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
-
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
Playing as Defender
Key Principles
-
Prevention over escape — deny the initial wrist capture by keeping your elbows tight to your body and avoiding arm extensions past your torso centerline
-
Recognize the grip transition early — the moment the attacker releases crossface with their hand, they are likely targeting your arm for the Kimura wrist capture
-
Never straighten your arm under the figure-four grip — a bent arm at 90 degrees gives you the strongest defensive structure against rotation
-
Turn toward the attack, not away — rolling away from the Kimura exposes your back, while turning into the attacker relieves rotational pressure on the shoulder
-
Tap early and tap clearly — the Kimura from this position reaches the breaking point quickly because your mobility is compromised by the flattened position
-
Use grip defense as a bridge to positional recovery — clasping hands buys time but is not a permanent solution, use it to create space for frame recovery
Recognition Cues
-
The attacker releases their crossface hand from your jaw or neck and redirects it toward your extended arm — this grip change is the primary early warning signal
-
You feel the attacker’s far arm threading underneath your elbow while their other hand controls your wrist — this threading motion means the figure-four is being established
-
The attacker shifts their weight slightly toward your head side while maintaining chest pressure — this angle adjustment creates the rotational line needed for the Kimura finish
-
Your arm is isolated with your elbow away from your ribcage — any arm position where your elbow is more than six inches from your body is vulnerable to Kimura capture from this position
Escape Paths
-
Clasp hands to stall the figure-four, then bridge toward the Kimura side and use the space to re-establish knee shield half guard, breaking the attacker’s chest pressure
-
Hip escape toward the trapped leg side during the attacker’s grip adjustment, creating enough angle change to recover frames and return to functional half guard
-
Use the attacker’s commitment to the Kimura to create space for a deep half guard entry by diving under their hips on the opposite side
From Which Positions?
Match Outcome
Successful execution of Kimura from Flattened Half Guard leads to → Game Over
All submissions in BJJ ultimately converge to the same terminal state: the match ends when your opponent taps.