Clock Choke

During my year of Jiu Jitsu training I've heard of the clock choke but haven't learned it in class or looked it up. Last week my instructor showed it to us and I think I will end up using this a lot. It seems very effective as long as you can keep your opponent from defending.

This video does a good job of showing and explaining the basics of the clock choke.The version we learned in class was starting with one leg behind and one leg beside your opponent (opponent in turtle) and you didn't have a hold of the collar yet. I like how this video shows the transition into the clock choke starting from your back with your opponent in your guard.