Originally Posted by Peniel

On my back with my opponent in the full guard.
I lock knees and force his head down toward his chest. I move my forearm to the top of his head. With my left hand on his chin, I proceed to rotate his chin outward as I continue with downward pressure. I grab my left forearm with my right hand. You are open for body shots for a few seconds before the tap out.
This has never failed me in the ring.
A very important point is complete rotation of the head or his chin will just drive into his chest.
Practice this wit caution. At the point of unconsciousness the neck muscles will relax, at this point the vertebrae will separate.
This also works on top. Your thighs behind his knees and locked. Pull the head down convert from your hands to right forearm, grab your left arm with right hand apply downward pressure with forearm just a few inches from the elbow. Make sure to rotate the chin and head so that the chin doesn't contact the chest and block the maneuver.