Rear Collar Choke
Applied from back control using the gi lapels. Uses thumb-feed grip mechanics and leg positioning to convert body weight into maximum strangulation pressure.
5 steps
· save to drill into each- 1Establish a two-on-one grip with one hand under and one over the opponent's arm.22:43
- 2Place your thumb on the collar and feed the lapel through with your other hand.23:11
- 3Use the biting method to secure the grip and take out slack.23:32
- 4Take the second lapel down toward the crotch to remove remaining slack.23:58
- 5Place one leg over the shoulder and the other across the hip, then sit back.25:03
From the source video

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Then the round started — and you forgot it.