This is one of my favorite ways of pinning people. It is super simple and easy to setup. Check it out and let me know what you think:
http://davidavellan.com/underhook-pin
http://DavidAvellan.com/underhook-pin
Believe and Achieve,
David Avellan
I will practice that next week.
Sub 
Very nice.
In a real life fight, this is likely the best use of grappling: controlling your opponent and then being able to just grind him out with strikes.
I have a friend who is currently under house-arrest for RNC'ing a guy, which is "potentially lethal force" and a true felony.
If he had simply pinned the guy down and given him a little chin-music with some sort elbow strikes, it would probably have been just written off as a scuffle with minor legal implications.