Rear Naked Choke
Used from back control to finish a match quickly. It solves the problem of a tucked chin and defensive hands by using a thin-to-thick entry, hidden wrist cross, and rotational leverage instead of arm squeezing.
10 steps
· save to drill into each- 1Lean in behind the seated opponent with one arm under and one arm over.4:10
- 2Stop the opponent from rotating by keeping your elbow in front of their shoulder.4:53
- 3Check for wrist-width space between the opponent's chin and chest.6:46
- 4Flatten your fist and use your thumb knuckle to penetrate under the jawline.8:47
- 5Extend your fingers and walk them across the neck until the whole thumb is under.9:28
- 6Lift with the flattened hand and shoot the elbow around the corner.10:04
- 7Place your strangle hand behind the nape of the neck, never on the shoulder or skull.11:00
- 8Cross your wrists by bringing the control hand to your own wrist or shoulder.11:17
- 9Rotate your elbow over the opponent's shoulder and lock the choke with your chin.12:08
- 10Clamp both elbows to control the opponent's upper body rotation.17:46
Source video

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Then the round started — and you forgot it.