Many people haven't heard of Mauricio Gomes, but he should be much more well known. Not only is he a Brazilian jiu jitsu coral belt and one of only six people to have been awarded the black belt by the legendary Rolls Gracie, but he is also the father of the GOAT, Roger Gracie.
Mauricio is famous in the jiu-jitsu community for his knee-on-belly (which should perhaps be called knee-on-chest). Many consider him to be the finest teacher and practitioner of this position in the world. He has recently released a series of four videos explaining the key details that make his knee-on-belly so devastating.
In this first video, Mauricio explains how he avoided being put into the half guard when transitioning into the position:
The second video shows Mauricio teaching one of his students the key points of how to position yourself and your foot when in the knee-on-belly position:
In the third video in the series, Mauricio teaches how he applies the near side armbar from knee-on-belly:
In the fourth and final video in the series, Mauricio teaches how he applies the far side kimura from knee-on-belly:
You can learn more about Mauricio at his website