The first video below just shows a set-up for De la Riva guard:
Next, this is one sweep from De la Riva guard. It is quite important to really hold the foot to make the sweep work properly, but please correct me if I am wrong...
And last, another "sweep" you can use from De la Riva to take your opponents back. I could not make it work but I know there people there who makes it work pretty well.
Hell... I am tired. Enough for today.