This is the version I was taught and the one we did in class 12/13. It involves grabbing the belt or hips and has the ride at the end:
This one has a little bit different arm work in ducking the head to the other side. I’d feel weird about the left elbow position where he’s not holding onto the left leg. I haven’t played with that variation though. He does have an answer for someone whose weight is too far forward and also adds another sweep into a leg drag:
This third video is the biggest departure from what we’ve covered so far. First, his entry into x guard starts with more of a single leg x position that waits for the top guy to make space for the two leg x guard. He doesn’t like the ride at all and prefers to grab the ankles right away rather than going for the belt. To me, there’s a tradeoff here. When the belt version works and your opponent goes for the ride, the end point is a pretty solid back control position. However, it may be the case that the success rate is somewhat lower. The ankle grabbing version might have fewer escapees from the x guard, but it seems like much more of a fight to get a solid back position. We can work on this sequence next time.