2 Part Technique - The best control from which to attack the North South Choke is Double Over Control, i.e. hugging your opponent's arms to his sides, away from his neck, with overhooks. This will grant you a clear, undefended shot when you look to slide back and wrap around his neck for the finish. When you run to the North South position from Side Control, look to scoop underneath both of his wrists from their tightly defended posture. If you can only get the farside arm out of the way into Over Under Control, circle your hip into his face until you can snake your hand through his defending arm for the Double Over.