Chapter: Attack from Guard
Move: Follow up to the Triangle

This move can be used when your opponent tries to block your attempted triangle choke and you can't get his arm across your body to apply the choke.
The first part of the move is done by puting your (right arm in this move) arm across the jaw or the throat to create some space as shown.
Now reach up with your other hand and grab your ankle while still pressing your arm across his face.
Here you will want to reach under your calf with your right hand and pull down.
This is a close up of the grip used in the previous picture. You will now want to put your left foot in his hip if it isn't already, and pivot to your right to try and wedge the blade of your right forearm under his jaw on the throat.
Now reapply the the lock with your feet.
This is a close up of the previous picture. Notice the grip slightly above the ankle to ensure tightness in the choke.

ENJOY!

This move can be found on page I-40 in the Fighter's Notebook.