Hi there. Half guard is my favorite position to fight from. I spent about 3 months doing nothing but half guard during rolling sessions to get it to start working. Once it DID start working, though, it became a very dangerous position. Also, please do not check out Submissions101.com’s older videos; only their newer vids, when they started traing with Keith Owen.
Some things you have to remember when fighting in half guard:
1.) You cannot be flattened out. You have to create some space between your opponent and your hips/chest OR be on your side to be able to set up anything. If you get flattened out, step 1 is always to scoot, scoop, fight for the underhooks etc, do whatever to get off your back and make space.
2.) Don’t let your opponent turn his hips and face your legs. Like in the pic you posted. Looking at the pic, what the guy on the bottom has to do is use his right arm/elbow to prevent (what you see his right arm doing in that pic) the person on top from turning completely and beginning the pass.
Some common situations from half guard:
Let’s assume that you have your opponent’s left leg trapped with your legs.
1.) Your opponent has the same side underhook.
-One thing that I like to do is switch my leg hooks (put my left leg over the trapped leg and free up my right leg) then insert my right leg as a half-butterfly into my opponent’s left leg. Keep your same side overhook to keep him from backing out. This half butterfly will prevent him from driving his weight on you.
Scoot your hips out a bit (if you’re flexible like me, you can skip that) and control the far side wrist. Take your half butterfly out and put it on the bicep/shoulder of the arm whose wrist you’re controlling. Go for the triangle by chopping down on the guy’s head with the leg that your put up, release your same side leg hook to complete the triangle. Adjust.
2.) You have the same side underhook.
-Step one is to BE ON YOUR SIDE AND MOVE DOWN. One sweep (I think Eddie Bravo calls this “old school”. It’s my go to sweep. But DO NOT do it with the Lockdown) you can do is to grab the guy’s far side foot. Pull it towards you with both your hands and trap it behind his butt.
Once you grab his foot (grab at the toes, not at the ankle or shin), switch your leg hooks, slide your right leg under his (keeping your left leg over his leg) and drive into him like you would a wrestling high crotch takedown. Make sure to pass his guard right after the sweep, you don’t want to end up in his half guard.
As much as I’d love to help, there’s not much I can do on the forum. You should ask your instructor about half guard. Also, check out Stephan Kesting’s “The Dynamic Half Guard” DVD. I learned a lot from that and it really helped my half guard game.