Here are 2 great options to deal with the top Half Guard Switch Base (when your opponent is facing your legs).
If you are a Half-Guard player then you are very familiar with the Dogfight position.
This is a very specific and situational Triangle Choke from reverse half-guard that we don't see very often.
This is one of my favorite Half-Guard sweeps and it's the epitome of Jiu-Jitsu. It's simple, anyone can do it, requires little effort, and it has been proven to work at the highest levels.
This is a must-know transition, especially if you do No-Gi. Since you don't have the luxury of collar and sleeve controls in No-Gi, your Spider Guard, De La Riva, and Lasso Guard are not that effective...