One reason I’ve heard that sports divide into groups by gender is that men are afraid they’ll get beaten by women. It happened in early baseball IIRC. (source: hazy memory. Disclaimer: I am male)
The recent decision affects AMAB people who want to play in the women's circuit, but does not bar them from the open circuit.
It's a pretty shit decision as far as I can see, but it's good to make judgments on the facts.
One reason I’ve heard that sports divide into groups by gender is that men are afraid they’ll get beaten by women. It happened in early baseball IIRC. (source: hazy memory. Disclaimer: I am male)
It mostly boils down to male fragility
https://theconversation.com/whats-behind-the-gender-imbalance-in-top-level-chess-150637
Out of curiosity, how did you get male fragility from that?
Reading through it there were several effects mentioned.
Testosterone makes men more likely to push to the highest level.
Women are discouraged from playing chess, and so less are set on a course to be amongst the best.
Women perform worse when they know they are competing against a man (thought to be a self fulfilling prophecy from stereotypes). Men don't seem affected by this.
None of those seem to be male fragility.