Taking the Back with Espen Mathiesen ( Part 1 The X Hook) 

This video Espen Mathiesen overviews one of the most powerful controls in Jiu Jitsu. The X hook is a variation for taking the back from a crab ride. It is often less stressful on the neck and very easy to transition to from the Berimbolo. Tommy Langaker and Espen Mathiesen have been using this technique at the highest levels of black belt competition over the last years with great success. If you like the video be sure to check out their site for more content.
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