This is a collar choke we call the Moose choke, after the nickname of the Judoka who first showed it to us. It's similar to brabo and/or darce style chokes, but the coller grip adds something unique. You'll probably notice I stay on my knees, which I shouldn't - the choke was comming on really fast so I kinda layed off a bit.
This choke also has a cool follow-up, called the Rowena Turn.
Look for more videos at http://www.graplyrz.com
Chris slides in with his knee to open up Kyle's turtle.
Keeping weight on Kyle, Chris pushes the collar forward for a better grip.
Chris reaches under Kyle's arm pit to grip the collar next to his artery. This still is just for perspective. There's no lifting to get the grip.
Chris's left arms is reaching under Kyle's armpit and chest to grip his lapel, neck to his neck. His right hand is gripping the top of the collar, thumb out, palm up, and his forarm is following the line of Kyle's spine.
Chris curls his top hand to the side of Kyle's neck. He can start applying the choke here by pulling his forearms together.
Chris drives Kyle over his front shoulder so he can use his weight to help complete the choke. He stays on his knee though -shame on him. He should be driving his hips to the mat for more pressure. No mercy!