[Thereasione]

It is "Nurture over Nature" approach. From wiki about Laszlo Polgar, father of Polgar sisters http://en.wikipedia.org/wiki/L%C3%A1szl%C3%B3_Polg%C3%A1r :

>He is interested in the proper method of rearing children, believing that "geniuses are made, not born".

>He home-schooled their three daughters, primarily in chess, and all three went on to become strong players. An early result was Susan's winning the Budapest Chess Championship for girls under 11 at the age of four. Also his daughter, Judit, could defeat him at chess when she was just five.

Judit became the best female chess player ever and was the youngest GM back then when she was 15.