The Mounted Wrapping Shoulder Lock is an elbow lock that can be done from the mount or guard positions. This is a very basic and simple lock with has a high success rate in Brazilian Jiu Jitsu.
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An option for a choke when you have an arm bound off a switch back sweep. Another option when the arm is bound is to go for an arm triangle as well.
Keith Owen (Pedro Sauer Black Belt) talks about preventing the mount when you are on your back and your partner has the cross side position. He discusses proper hand position and movement. Visit Keith