How do you know testosterone isn't performance enhancing? There are clear replicated correlations to testosterone levels and spatial rotation tasks in the literature.
Why do purely mental games like bridge and chess have separate men's and women's tournaments?
The reason (in chess at least, which is what I'm familiar with) is to encourage more women to play chess, to close the gender gap formed in the first 150 years centuries of international organized chess.
Why do purely mental games like bridge and chess have separate men's and women's tournaments?