The key factor separating geniuses from the merely accomplished is not a divine spark. It's not I.Q., a generally bad predictor of success, even in realms like chess. Instead, it's deliberate practice. Top performers spend more hours (many more hours) rigorously practicing their craft.
The Social Animal: The Hidden Sources of Love, Character, and Achievement (ed. Random House, 2011) - ISBN: 9780679603931