I came across two good videos on the deep half guard. This guard can be pulled off in BJJ and MMA. If you doubt it’s effectiveness in MMA, watch a few videos with Antonio Noguiera. It’s his go to position when starting in half guard.
The first is a basic overview of positioning which is very important. Positioning makes or breaks a lot of positions, but is especially important with deep half guard. The second video is an advanced option into the Z Guard.
Here Stephen has a good, basic overview of the deep half guard. If you’re new to the deep half guard or new to Brazilian Jiu-Jitsu, stop here and watch this video a few times.
Here Vinny is showing an advanced option that is good to try. Z Guard is a lot of fun and this is a good basic sweep to get aquainted with.
Make sure to note his grip at 1:10. He is gripping high at the knee instead of low at the ankle to control the leg.