Which Knee on Belly Choke is Right For You?
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Arm Isolation Triangle — From Knee-on-Belly·ROYDEAN
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Translation: Shoulder Hold / Head-and-Arm Choke — From Knee-on-Belly
Range & classification
Category
Strike & defenceLocksClose rangeFighting multiple people
Distance
CloseMiddleLong
Body target
Upper bodyMiddle bodyLower body
Overview
A head-and-arm choke (kata gatame) applied from knee-on-belly. The attacker pins the opponent with the knee ride, isolates the near arm across the opponent’s neck, and drives the shoulder and chest into the carotid while locking a head-and-arm clamp. Finish is created by shoulder adduction, chest pressure, and angle change—not by leg triangling.
History & Origin
Modern BJJ adaptation of kata gatame that emphasizes using the mobile knee-on-belly pin to create the arm-across feed and immediate finishing pressure.
Country of origin· shown in random order
- BrazilBJJ, Submission Grappling, MMA
- Japan肩固め（膝乗せから）(Kata Gatame — From Knee-on-Belly)BJJ, Judo, Submission Grappling
- USASubmission Grappling, MMA
Effectiveness
Effective as both a submission and a positional control threat; the knee-on-belly base limits the opponent's mobility while the arm isolation creates a direct path to the choke. [1]
Lineage
The arm triangle from knee-on-belly was developed in BJJ as an advanced positional submission, combining pressure with strangulation. [1]
Competition Record
Arm triangles from knee-on-belly are used in advanced BJJ competition, particularly at black belt level. [1]
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Biomechanical Mechanism
Action — Lateral vascular compression using opponent’s trapped arm against their neck plus attacker’s shoulder/chest pressure
Joints Affected — Neck (carotid arteries), shoulder of the trapped arm
Torque/Force — Shoulder adduction with scapular protraction; chest drop; head positioning to close space; base stabilized by knee-on-belly
Position & Entry
From side control, post to **knee-on-belly** (knee centered, toes active). With your **right hand** cross-face across the jawline to turn the head away; your left hand controls the near wrist/triceps and **feeds the arm across** the opponent’s neck. Slide your **right arm under the head** and around the opponent’s neck/arm, connect palms (gable) or RNC-style (grab right biceps, left hand to crown). Keep knee pressure to pin hips, **drop right shoulder** toward the neck, **walk your body toward the head at ~45°**, and sprawl the left leg for base. Squeeze elbows, drive chest, and micro-adjust head position to close the space for the choke. Optionally transition to mount while maintaining the lock if you need more pressure.
Variants
High-knee pin to kata gatame
Knee-on-belly to mounted kata gatame finish
Wrist-control (C-grip) feed across
Underhook drag feed across
Videos
1 video
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Ratings
Risk of injury to the person this technique is applied to
9
Extreme9/10
Direct vascular choke from dominant top control; loss of consciousness can be fast once sealed.
Skill level needed to execute this technique reliably
Advanced
Whether this technique is allowed under major competition rule sets
Illegal
FIAS Sport Sambo— no chokes in sport sambo, FIAS Rules 2024
Legal
IBJJFIJFUnified MMAADCC
Training Notes
✓Maintain knee ride pressure to stop hip shrimping
✓Keep the opponent’s elbow **high and across**—if it slips below the chin, reset the feed
✓Finish by **angling** (walk toward the head and drop shoulder), not just squeezing arms
✓If space remains, transition to mount or switch to d’arce/anaconda as the arm slips.
Common Mistakes
!Trying to finish without the arm truly across the neck
!Leaning too far forward and getting rolled
!Keeping head too high (leaves space)
!Squeezing without walking angle/shoulder drop (becomes neck crank instead of choke).
Related Techniques
Counter Techniques
Tuck Chin — protect the neck by lowering the chin to prevent the choke from sinkingTwo-on-One Grip Fight — use both hands to strip the choking grip before it locksTurn Into — rotate toward the choking arm to relieve carotid pressurePosture Up — straighten the spine and create distance to break the choking angle
Setup Chain
1Achieve Controlling Position — secure the position from which the choke is applied
2Isolate the Neck — clear defending hands and establish access to the throat
3Set the Grip — lock the choking configuration (arm, lapel, or leg placement)
4Apply Pressure — squeeze to compress the carotid arteries for the finish
Sources & References
Primary Source
Kodokan Judo — Official Katame-waza Classification (肩固め Kata-gatame)
1BookKodokan Judo — Official Katame-waza Classification (肩固め Kata-gatame)
Japanese terminology sourced from Kodokan Judo — Official Katame-waza Classification (肩固め Kata-gatame)
Official Kodokan ground technique classification system
3OtherJapanese Martial Arts Standard Terminology (武道用語)
Established Japanese martial arts naming convention — native Japanese term (和語/漢語)
4CitationKodokan Judo — Official Katame-waza Classification (肩固め Kata-gatame)
Japanese terminology sourced from Kodokan Judo — Official Katame-waza Classification (肩固め Kata-gatame)
Community
Athletics
Requires
hip flexibility, long legs relative to torso
Favours
longer limbs for easier figure-four lock around head and arm
Key muscles
hip adductors, hamstrings, quadriceps
Notes
Functions as both a submission and control position—if choke fails, attacker can transition smoothly into mount, armbar, or back take.
Frequently Asked Questions
What should I do if my opponent pushes my knee off during knee-on-belly?
Let them push your knee off and turn into you—this is actually what you want. According to ROYDEAN, when they turn into you, you can grab the collar ridge, circle your forearm around to create a wall, and finish the choke by rolling your bottom wrist up into the neck.
How do I set up the grip correctly for the arm isolation triangle from knee-on-belly?
ROYDEAN recommends opening the collar, grabbing the ridged material, and starting your forearm at about the middle of the opponent's head. Then circle your forearm around tightly so the top arm becomes a wall, with your bottom wrist ready to roll up into the neck.
What if I'm too short to finish the choke with my pinky in the crook of my elbow?
ROYDEAN suggests modifying the grip for bigger opponents or if you're shorter: instead of pinky-to-elbow, simply place your hand flat on your forearm and roll it up the same way as you compress.
How do I finish if my opponent has an underhook and his arm is stuck in front of him?
ROYDEAN recommends threatening an armlock by straightening your arm on the ground to push against their elbow, forcing them to turn. Once they turn in, dive your shoulder below their lat to enter the triangle position and finish the choke.
How does the Arm Isolation Triangle — From Knee-on-Belly work?
A head-and-arm choke (kata gatame) applied from knee-on-belly. The attacker pins the opponent with the knee ride, isolates the near arm across the opponent’s neck, and drives the shoulder and chest into the carotid while locking a head-and-arm clamp.
Where does the Arm Isolation Triangle — From Knee-on-Belly come from?
Modern BJJ adaptation of kata gatame that emphasizes using the mobile knee-on-belly pin to create the arm-across feed and immediate finishing pressure.
How dangerous is the Arm Isolation Triangle — From Knee-on-Belly?
Danger: 9/10 | Direct vascular choke from dominant top control; loss of consciousness can be fast once sealed.
How do I set up the Arm Isolation Triangle — From Knee-on-Belly?
The standard setup chain: Achieve Controlling Position → Isolate the Neck → Set the Grip → Apply Pressure.
How do I defend against the Arm Isolation Triangle — From Knee-on-Belly?
Standard counters include: Tuck Chin — protect the neck by lowering the chin to prevent the choke from sinking / Two-on-One Grip Fight — use both hands to strip the choking grip before it locks / Turn Into — rotate toward the choking arm to relieve carotid pressure / Posture Up — straighten the spine and create distance to break the choking angle.
What are the variants of the Arm Isolation Triangle — From Knee-on-Belly?
Common variants: High-knee pin to kata gatame; Knee-on-belly to mounted kata gatame finish; Wrist-control (C-grip) feed across; Underhook drag feed across.
How effective is the Arm Isolation Triangle — From Knee-on-Belly in competition?
Arm triangles from knee-on-belly are used in advanced BJJ competition, particularly at black belt level.
What are common mistakes when doing the Arm Isolation Triangle — From Knee-on-Belly?
Top errors to watch for: Trying to finish without the arm truly across the neck / Leaning too far forward and getting rolled / Keeping head too high (leaves space) / Squeezing without walking angle/shoulder drop (becomes neck crank instead of choke)..
What are other names for the Arm Isolation Triangle — From Knee-on-Belly?
The Arm Isolation Triangle — From Knee-on-Belly is also known as Kata Gatame — From Knee-on-Belly, KOB Kata Gatame — Arm-Isolation, Knee Ride Head-and-Arm, Knee-on-Belly Arm Triangle.