It comes down to the principle of having a category for women. In every game, whether it is chess, darts, snooker gaming, monopoly, men do better. This may be simply because they are socialised from birth to win, to compete, to take risks. Girls are socialised to "be nice".
When i was in primary 4, my teacher ran a game of Buzz every morning, the maths game. Every time someone got it wrong you had to sit down. Therexwas a prize at the end of the year for the person who won the most games
I can clearly remember all the girls not trying, how they acted a bit dippy when they got it wrong and got to sit down. Not me - I was determined to win. In the end it was between me and one of the boys. And i was taunted for it. Girls thought I was crazy. Boys were angry. I am asd and didn't care. And I won! Teacher wasn't even happy.
This is what girls are up against. Boys are socialised to get the prizes. Girls defer to them.
Then there is the seismic of a lot of the guys in these games, which puts many girls off. Chess tournaments are renowned for it.