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Could a white belt defeat Jon Jones in a Brazilian jiu-jitsu match?
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No, Brazilian jiu-jitsu is a martial art focusing on grappling and ground fighting, originally based on Kodokan judo newaza taught by Mitsuyo Maeda. A white belt is the lowest ranking in Brazilian jiu-jitsu. Jon Jones has a purple belt in Brazilian jiu-jitsu under Roberto Alencar.