GCP Episode 137: David "Silverfox" Karchmer
November 30, 2016
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1:34:02
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E137
One of the most experienced and recognized BJJ referees in the United States, Professor Karchmer has reffed well over 3,000 matches in his career. He discusses some of the subtle intricacies of reffing that many competitors may not take into consideration, his opinion on common rules, the elements of a good ref and bias in big tournaments
