We all have that training partner that is really flexible and whenever you roll with them, you spend a long time trying to solve the riddle of their guard…
Sometimes the best way to know how to pass an impassable guard, is to ask someone who is known for having one, exactly what are the things that put them in danger. Japanese BJJ player Masafumi Matsumoto wrote this excellent piece detailing all those things:
BJJ black belt, Max Carvalho has a special pass that surprises impassable and flexible guards.
The important details is to pin one leg, and then leg drag the other leg.