2 - IF YOU JUST STARTED PLAYING HALF-GUARD, AVOID GIVING UP THE UNDERHOOK: I believe that the easiest way to start effectively playing from half-guard is to start from the knee shield (Z-Guard). From there, you can maintain distance between you and your opponent and start developing your half-guard game without being “smashed”.
3 – AVOID THE KIMURA – DON'T LET YOUR OPPONENT GET A DOUBLE WRIST LOCK GRIP: This is probably one of the questions I receive most frequently. What should I do if my opponent tries a Kimura on me? Well, if he gets the Kimura grip, you are already at a huge disadvantage; you should have stopped it before he got there. I have a way for example in the deep half-guard to stop the Kimura: it's been working well for me. When my opponent touches my arm trying to go for the kimura, I bump him forward, forcing him to post his hands on the mat, to stop himself from being swept, so he can't get the grip on the Kimura
4 – IF HE GETS THE UNDERHOOK, DON'T GET DESPERATE: This is a very important point! Many times I see people trying to play half-guard, but once the person on top gets the under hook, the guy on bottom gets completely desperate and starts moving frantically to try to get out of there. Instead, you need to keep your composure and work on some sweeps when your opponent has this grip. Some of my most effective sweeps come from there!
5 - AS UNPLEASANT AS IT SOUNDS, GET USED TO TAKING HIS SHOULDER PRESSURE ON YOUR FACE: This is a very important point. If you are one of those that once the guy puts their shoulder on your face, you open up everything to try to get out of there, half-guard might be a tough game for you. You are going to need to take some pressure if you want to play half guard.. Shoulder pressure is tough to handle, I agree, but its not the end of the world, and if you can develop an offensive game even when under some pressure from a strong guy - you find yourself able to see a lot more opportunities to sweep.