As it is viable option to establish a guard pass and submission, it is important to cover this topic at least 4 weeks per year.
This position and the north south choke has been made very popular by Marcelo Garcia and I wrote a report a while ago.
So go check out the link
I did not teach this technique because I wanted to cover more basic principles in the beginner class but will over it in the next North South position which will come up in 3 months time.
Next week, we will be covering guard subs such as arm bar and triangle in the beginner class