Brazilian Jiu-Jitsu has been proven to be an effective self dense system, however many of its detractors bring up the case of multiple attackers.
In reality, there is no perfect martial art against multiple attackers.
As Navy Seal and BJJ black belt Jocko Willink says, the best strategy is to run:
But what about when two women BJJ practitioners face a 180kg white belt with 1,5 year experience in BJJ?
BJJ brown belt Emi Fujino and purple belt Mina Kurobe wanted to test themselves and they did so by facing ‘Big Joe’, a huge American who lives and trains in Japan.
They are fighting in BJJ rules, to the submission.
Let’s see what happens (fight starts from 7:10 min) :