World chess federation bars transgender women from competing in women's events
apnews.com
The world’s top chess federation has ruled that transgender women cannot compete in its official events for females until an assessment of gender change is made by its officials.
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They consider trans women men, and men are smarter than women. That's what it implies anyway.
Being good at chess isn't about being "smart", a lot of top chess players will tell you as much. It is however about things like spatial awareness and pattern recognition, and some studies have demonstrated those traits to be, on average, stronger in male subjects. I'm sure evidence to the contrary exists though.