I'd recommend not taking the stand that "women are physically disadvantaged in chess" is a "simple fact." You welcomed citations for reasons why that may or may not be - but much like sociological studies across ethnic differences in accomplishment, studies across gender differences accomplishment for non-physical activity are going to be, shall we say, "muddled."

People may not be able to levy citations that argue against that thesis, but it's still a very difficult thesis to defend both socially and rhetorically. Engaging in dialectics about it is unlikely to be productive, and I think it's probably more fair to take an even ground in the absence of compelling evidence on other side. Extrinsically, yes, women display collective disparity in overall chess accomplishment. But we cannot infer anything about womens' chess ability intrinsically unless we have more women in chess. Specifically, we cannot infer anything physically about the female brain that would demonstrate a disadvantage.

This doesn't mean you're wrong; it just means that it's so emotionally loaded, and so devoid of clear, replicable data that even a debate with citations will probably be disappointing at best, and personally insulting at worst.