In this video Eddie Bravo goes over the most effective back control to date. Once your opponent's back is exposed the very first thing you should do is get the over / under control.
The harder you squeeze the control the more secure your position. You want to get your hooks in or a body triangle on em but Marcelo Garcia will finish guys from the over / under position alone.
The key is the ball & socket grip that Marcelo uses. The hand of the underhook closes on the closed fist of the overhook. That way when your opponent goes for wrist control to defend the choke they have to peel the underhook hand which opens the path for your overhook hand to go around the neck for the choke.
