I want to tell you guys how I, a poor blue belt, escape the north south position, i.e. which escape has worked the most often for me. Perhaps you guys can give me some pointers such as if you think the escape is any good, if it will also work against better guys (I've been able to pull it off on a high blue belt several times), etc. Also, perhaps someone will be able to incorporate this escape into his/her game.
Anyway, here is is...
You start in a posture under the side mount that I like to call the "straight jacket" posture. Let's say that your opponent is on your right side. Your left hand is touching your right hip and your right hand is touching your left shoulder. Your elbows are glued to your body. It's very hard for your opponent to underhook your left arm. You try to touch your shoulderblades together, hunching your back and only your right hip, not your left, is touching the mat.
He starts to try to get the crossface and far underhook grip on you, but realizes that if he goes for it, he won't get the underhook - YOU will get the underhook - and you might take his back. So he switches to the other, standard, "overhook and hip check" side mount (one arm overhooking your far, left arm, other arm by your hip).
When he does this, underhook his right arm with your left (but keep your left elbow tight to your rib cage still).
He runs around to north south. AS he's doing this, drive with your underhook and follow his right armpit (so you don't lose your underhook). Simultaneously, try to turn onto your right side and get your right elbow underneath your ribs.
THE EFFECT IS THAT BOTH YOUR ARMS WILL END UP BEING ON THE SAME SIDE OF YOUR OPPONENT WHEN HE REACHES NORTH SOUTH and therefore it's relatively easy to get to your knees. His chest will be on your left upper arm.
If you can't quite make it, raise both legs high up in the air with legs straight, and then "scissor them" to get the momentum you need to get to your knees.