It's easy to find articles in the media examining the reasons why men are better at women at chess. Example, example. These articles generally operate with the null hypothesis that men and women are equally good at chess.
However, there also seems to be a consensus that chess is a sport. FIDE have been trying to get chess included in the Olympics, and in the ongoing World Championship, game 6, there were plenty of comments about how tiring it must be for the players or how important physical condition is.
Usually men are better than women at most physical sports, how are these apparently contradictory positions reconciled?