I read the whole article but didn't see anything new. Filled with statements like "To accumulate this body of structured knowledge grandmasters typically engage in years of effortful study, continually tackling challenges that lie just beyond their competence. The top performers in music, mathematics and sports appear to gain their expertise in the same way, motivated by competitioin and the joy of victory." I've seen people spend years of "effortful study" and never get beyond 1500. The author, Philip Ross is fairly highly rated in USCF, however, he simply presents a rehash of old studies, especially de Groot (who recently passed away). I'd like to see a new scientific study of chess performance, as clinical as one can get, using a variety of age groups. I believe it would be relevant to many fields, not just chess. I'm sorry, I read the article carefully but wasn't enlightened one bit.