Did the Gracie's ever lose a dojo challenge?

[Supereem]

You guys think sambo dudes would beat the gracies in a fight at that time? Wouldn't the gracies just position fark them?

Ron Tripp's win over Rickson was somewhat of a fluke in my opinion. Rigan Machado destroyed him under Sambo rules and played around with him (he asked everyone what move they wanted him to finish Ron with and he did it).