One of my gym mates who is judo black belt but white in BJJ, told me he has to compete in Blue belt (due to judo black belt) in upcoming bjj comp.
Is this common and does it applicable to other comps? What if you don't declare it, is that way they can find out?
Is this common and does it applicable to other comps? What if you don't declare it, is that way they can find out?