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One of the main reasons for segregating chess by gender is the significant rating disparity between men and women. On average, men tend to have higher ratings than women in the chess world. This rating difference has often been attributed to various factors such as societal norms, cultural expectations, and differences in opportunities for competitive play.
It is important to note that the rating disparity does not imply any inherent difference in skill or intelligence between men and women. However, the rating system is based on performance and results, and if women consistently achieve lower ratings than men, it can create a perception of inferiority
https://ocfchess.org/why-is-chess-segregated-by-gender