Coach John Saylor teaches a variation of Kata Juji Jime (Half Cross Choke) in this video.

Here is an effective breakdown in groundfighting that is a basic move, but an important one and one that is used often. This video also shows how to drill on this move as well.

What to do in a grappling or BJJ session when you’re starting on your knees. In the above video I refer to some other videos and articles: here are the links: https://www.youtube.com/watch?v=8Ib2zicFVnM and http://www.grapplearts.com/on-starting-sparring-from-the-knees/

Charles Peters shows an unusual turnover that gets you out of kesa gatame

Christina shows a reverse choke for judo.

Steve Lord shows a way to bait an opponent into passing the guard, then catching him with an armlock. See more at http://www.baltimoremartialarts.com/