This is Part 1 of the classic 98 minute Rickson Gracie documentary covering the Vale Tudo 95 MMA event in Japan. The remaining segments are with-in the site. An interesting look at a famous figure during the early days of the new sport.
A good breakdown from Denis Kang on how to effectively strike from with-in the guard. Kenny Florian's fights are a great example of how cutting elbow strikes (delivered at the tip of the elbow) are much more likely to open someone up than smashing elbows (delivered from the forearm).
How to Ground and Pound in MMA with Punches and Elbows