Sliding Collar Choke From The Back Mount - Brazilian Jiu-Jitsu Techniques

From the back mount, take your right arm in front of your opponents neck and grab their collar with your thumb on the inside (fingers outside). Try to get a very deep grip.

Take your left hand under your opponents left arm-pit and grab the other side of their collar. This hand is used to make sure there is no slack in the collar when you apply the choke.

Pull your right elbow back and push your left hand directly down (do not pull it round to the left).