Sometimes, when I was in De La Riva guard and sat up to go for a sweep, my opponent would put their knee on my chest and stop me from coming up. After analyzing the situation, I ended up finding the solution with the movement I show in the video lesson below.
Shall we go through the explanation?
De La Riva guard sweep
The start

Whenever I tried to sit up for a sweep, for example the De La Riva Guard Sweep, my opponent would drop their knee onto my chest and stop me from coming up. Based on that problem, I started working on a way to sweep them in that situation.
To do this movement, your opponent can't be leaning too far back in their posture, because that will make it hard to pull them up.
Feeding the arm

As I show in the video, when I push my partner away with my right leg and sit up, I grip her right sleeve, then pass her arm between her legs and feed it to my other hand. At this point I adjust to try the sweep, but my partner makes it harder by driving her knee toward my chest.
Knee grip
With my right hand, I grip my partner at the line of her knee. It's important to stress that the grip is made with the palm facing up, so that I can do the final movement.
Sweeping

In one single movement, I slide underneath my partner, as if I were pulling deep half guard, and at the same time I punch upward with my right hand, rolling her over the top of me and completing the sweep.
Questions
What about you, do you like playing De La Riva guard? Have you run into this problem before?
I hope this helped, and I'm here to help with whatever you need.
Don't forget to share it with your training partners and leave a like on the video!
Good training!
OSSSS



