First pinch is ninja dave's style neck pinch. It's a lock between the back of the head / neck and the shoulder. The second shown is a more standard lock, between the raised shoulder / arm and the side of the neck. The final one is the lock on the front. Needing you to have more stick on the front of your body. Lean back slightly and lock between your raised arm and neck / throat.
(Right click, save target as... )
Streaming Flash Video: