The close guard is one of the most common and effective weapons you can have in your Brazilian Jiu Jitsu development.
At our School, DS TEAM JIU JITSU, we have a strong focus on Fundamentals and we review our Fundamentals Program every 3 months.
In the video below, Sensei Douglas Santos explains the the core concepts of the CROSS COLLAR CHOKE from closed guard.
The position must be correct, especially the first hand. Once the palm of your hand is facing you the rest is basically correct body alignment.
Pushing your body a a little sideways you can feel the neck falling into a deep choke. The second hand can be placed anywhere where it will be generating the last pressure until you complete the choke with precision.