courtesy of the good people of Abhaya ...
Encircled Collar Choke
I'd read an interview with Cassio Cardoso at On the Mat that was really fascinating. He seems like a real, old school jiu jitsu guy who was one of the people who was always supposed to fight Rickson in a jiu jitsu match but never did.
Here's a link to the interview ...
I went to Jiu Jitsu Gear Forum looking for stories about him. One of the stories--and there were an unfortunate few--talked about a certain choke that Cardoso did. In the story, Cardoso didn't just lift the choking elbow, he pulled and rolled, really sinking it in deep. I also think Cardoso wasn't working from the closed guard, which would have made the roll a bit more difficult.