Over the years, I've seen perhaps three dozen escapes from "100 Kilos" side control (when the person on top is blocking your hip and your head), and virtually all of them involve turning in to your partner and going for a tackle. This is, indeed, a classic and viable approach most of the time. However, when you're smaller than your opponent, or your opponent is fantastic at maintaining position, this approach can be virtually impossible. On the other hand, with proper frames, turning away can work out well for you.

This technique starts with building a frame underneath your opponent's near side shoulder, making sure that your right elbow (assuming your partner is on your right side) creeps underneath their armpit. Your left hand simply reinforces your right arm. You now have the ability to turn away from your partner, and indeed, many will simply go to their knees and then opt for an escape from turtle as an immediate follow-up.

However, if you're flexible, it is possible to build your base up onto your neck and shoulders as you're turning away, then swing your hips into your partner's direction, finally dropping your hips to the ground in between you and your partner.

Note: you might have to go straight into a "double under" stack defense here, but you also might catch a triangle if your partner responds poorly.