It's always amazed me that he was self taught. He must have been a good teacher to himself because he only lost 5 in the recognized 134 fights he had. Two of the three stoppages at the end of his career when he was a shadow of his formal self. One of his losses tabbed by the press. A hundred stoppages on his ledger. If one includes his booth fights, he probably fought well over 400 times. Biggest puncher in the history of the sport imo regardless of weight.