Ken Primola con Jiu JItsu: Passing The Sitting and Butterfly Guard (English Edition)
Passing the sitting and butterfly guard in Jiu Jitsu is a lot more complex than it looks. When I was younger and quicker I used to think it was easy to pass these guards because of my quickness. But eventually I understood being quick does not mean I am good at passing, especially against a very experienced guard payer. This can actually get me into trouble.
There are methods to passing skilled butterfly and sitting guards.
When you learn the step by step systematic format I can't guarantee you will pass everyone's guard with ease. But you will have a superior understanding and know what to do you will be able to recognize the traps your opponent is setting up and how to avoid them.
Have fun and be sure to implement these guard passes right away.