You have back control and you have your hooks in. You are trying to put a Rear Naked Choke or any choke on the guy for that matter but can’t get under his chin. Here is a funny but effective BJJ technique that I learned from Mark Johnson at West Side Jiu-Jitsu. Underneath your nose is a bundle of nerves. Now the funny part, rub in a sawing motion the nerves upward with the blade of your hand. It looks like you are scratching under their nose for them. At first they resist and then as you increase the pressure it hurts. The next thing you know they lift their head and you quickly slide your hand from the nose to the throat. When I saw this I realized that they use this when they take pictures of babies. The photographer would put her finger under my child’s nose to get her to raise her head for the photo. I always wondered why the child would look up so easily with it. Its not so much that it hurts at first as it is annoying. Below is a picture of me showing the position of your hand with my Submission Master Grappling Dummy. I know that descriptions don’t always work.