That is, none. Please, notice that is a quite old idea according to the first still images in the sequence below. They were produced very likely in the 40´s and I guess it was hosted in Europe (Germany?). The second sequence is a funny bout between two Afro-American that here and there escapes the referee control. And the third - the best one, is a good semi-competitive fight that might have come from Leather & Lace. This one was originally in slow motion and sound track is... weird.