The 'Epstecutioner' developed by Scott Epstein also known as Einstein is a back breaking submission that you can slap on your opponent from the top position.
I feel this is a very under used position. From the top position there are some good submissions and once you learn to control the position your opponent will have a really hard time getting you back in his guard.
A nice tight Head & Arm control is the key to controlling your opponent from this position. There are a few details to the position that will help you hold it. Check the Nutcracker page of details.
