Last night's class was a review of this material:

We were also shown another armbar variation. This involves posting a hand on the collarbone of the opponent, then pulling his arm across the body with your other hand. Once the arm is across the body, you slide a knee up under his shoulder (back side) so he can't bring the arm back down. You can either pull his arm up, and slide other other foot under his arm (front side) to set up the armbar, or you can pin his arm to the floor, and set up the armbar that way.

Tried the side control escape and the armbar escape from this thread :

Neither one worked for me.

I wasn't able to turn my arm over in the armbar escape, so I got about halfway around to my stomach and had to tap. Wasn't sure what I was doing wrong with the side-control escape, but simply couldn't move the guy's head far enough away to get my leg over.

Rolled with another guy who attempted a cross-collar choke. No problem, as I tucked my chin down tightly, there was no chance of the choke. He simply pulled the choke across my face so hard, I thought my jaw was going to break, and had to tap anyway.

Never had anyone even come close to breaking my jaw before from that! It is still sore today. That guy is gorilla strong.
"In case you ever wondered what it's like to be knocked out, it's like waking up from a nightmare only to discover it wasn't a dream." -Forrest Griffin