correlation between chess ability & IQ only moderate. being smart omstly makes you a better beginner. as in all games, men substantially better than women, though the reasons are unclear.https://www.sciencedirect.com/science/article/abs/pii/S0160289616301593?via%3Dihub …
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Stimulants: Caffeine makes me better to a point. Modafinil (which I use off and on) makes me markedly worse and tends to land me in time trouble.
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Interesting observation
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