Chapter: Attack from Rear Mount
Move: When opponent is in a tight turtle position

First, you will want to grab high around his chest. Grab your own wrist for a tight grip. You can't see in this picture but my right knee is on the ground against his body and my left leg(which you can see) is up and right behind my opponent.
2. Instead of rolling to the side, you will want to roll right over his head. To make this move work, you will want to push off with your foot. Still maintain a tight grip around his chest.
As you roll directly over his head, try to keep your chest as close to him as possible, while still maintaing a tight grip around his chest.
Just before your feet touch the ground, you will want to pull your opponent right over your head. You want to try and use the momentum of your roll to "snap" him over.
Again, the direction you want your opponent to come is directly over you.
To welcome your opponent into the rear mount, you will want to raise your hips just before he gets there and...
Throw your legs around him and place your feet over his legs as shown in this picture. Keep your hips up to ensure a secure position.
Sometimes your opponet will sense that he is about to be thrown and will defend by spreading his base out. You want to practice alot so you can sense his defense before you are flat on your back.--Then it will be too late to do the following....
Assuming that you have kept a tight grip around his chest, after your opponent defends, you want to pull yourself back in the direction you came...
And throw in your "hooks" to secure the position...
Now you should have obtained the rear mount. ENJOY!