So Judit Polgar finished last in Argentina with 4.5 points. Put it down to poor form, maybe bad food, lack of sun (some kibitzer on ICC said that she needed a tan, bad); whatever it is, Judit just had once of those tournaments. Ranked number 8 in the world, she is clearly above most men players. Still, she's a rarity amongst the best. How did she get there?
In this lengthy article, Psychology Today discusses exactly this question. Carlin Flora calls it "The Grandmaster Experiment".
See also: Breaking Through, Queen of the King's Game, Judit Polar: The Princess of Chess