This is a combination turnover and choke to follow-up when someone resists the Mosse Choke. It's often called the Rowena Turn, after female British Judoka Rowena Sweatman. It has some technical similarities to the Peruvian Necktie choke. In a Judo competition, it provides and oportunity to choke, or score oseakomi.
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We start with Kyle in the turtle.
Chris pushes weight in with his knee to open up Kyle's body.
Chris feeds his hand under and tries to apply the moose choke. Kyle it resisting by pushing back against Chris - he doesn't want to be turned on his side.
Chris wants to take advantage of that push. He props his foot next to Kyle's legs.
A look from the back angle. It's not necessary, but to get maximum effect, Chris will slide his foot so that it pushes into Kyle's leg to compromise his support.
Chris keeps everything tight and rolls toward's Kyle's back, rear corner. The trick is to remove all slack from his arms to take full advantage of the momentum his falling body generates.
As he is rolling back, Chris throws his leg over Kyle's head.
The choke can come on anytime the roll is started. Once Chris completes the roll, he has Kyle on his back and can score Oseakmoi, similar to yoko sankakyu. He can also apply the choke by extending his leg and pulling the collar with his hands.