The division of boxers into weight classes is based on the premise that if two men are equally talented practitioners of the Sweet Science, then the heavier man has a decided advantage. This is true, of course, only if both men are trained down hard, since a pound of beer is of no use in a boxing match. If the difference amounts to no more than a couple of pounds, it can be offset by a number of other factors, including luck, but when it goes up to five or six or seven, it takes a lot of beating.