Roger Gracie has 10 wins at the IBJJF World Jiu-Jitsu Championships as a black belt, with three of those victories in Open Weight competition.
In the 2009 Mundials he submitted all of his opponents in the super heavyweight and the absolute weight classes with a choke from the mount. Roger has not been submitted in competition since he was a blue belt.
In this video, he talks about the secret of his choking technique:
In the following video he explains in detail what the best way to execute that choke is. Hit The CC button for subtitles:
