[towaway15463]

I think you’d have to answer what the difference is between that group of chess masters and the rest of the population. Could you pick any random adult person off the street and train them to compete and win against the best of the best? Would their training take as long or longer than the current chess masters? My gut feeling is that the small differences between high performing people are evident of a population of geniuses rather than evidence against genius being a thing. If we were talking about athletic performance instead then I think it would be more evident, there are natural athletes who have some combination of physiological traits that allow them to perform better than others with the same training.