@Dropoffyourkey - yes, I was thinking something similar.
To be a top pro chess player, you have to basically live, breathe and sleep chess.
Men are more likely to go in for high risk/high reward behaviour.
Women typically tend to be more sensible and have different life balances, e.g. having children and child-rearing.
Feminists won't like to hear it but the average woman has XX chromosomes, is fertile, and wants children at some point.