NIce video Gustavo. I get a lot of mileage out of this. I use a slightly different grip with my forearm running in line with the spine and pressing down on the base of the neck with my elbow but I will give your grip a try and see how it works out. I am only a blue belt but this is one of maybe two things I would show somebody because it works for me even against higher belts. Very simple and very effective as long as pressure is maintained.