Arm Isolation Triangle — From Knee-on-Belly
Variety肩固め（膝乗せから）(Kata Gatame — From Knee-on-Belly)
TraditionalTranslation: Shoulder Hold / Head-and-Arm Choke — From Knee-on-Belly
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.
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
Position & Entry
Variants
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Ratings
Risk of injury to the person this technique is applied to
Direct vascular choke from dominant top control; loss of consciousness can be fast once sealed.
Skill level needed to execute this technique reliably
Whether this technique is allowed under major competition rule sets
Training Notes
Common Mistakes
Related Techniques
Counter Techniques
Setup Chain
Sources & References
Kodokan 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
Established Japanese martial arts naming convention — native Japanese term (和語/漢語)
Japanese terminology sourced from Kodokan Judo — Official Katame-waza Classification (肩固め Kata-gatame)
Community
Athletics
hip flexibility, long legs relative to torso
longer limbs for easier figure-four lock around head and arm
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
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.