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by will_pseudonym 2043 days ago
Absolutely. It is always a really indicator of if I'm tired or not if I start to fail a lot of chess puzzles where I should have seen something, but just didn't notice it because I was tired. As someone who tends to stay up late, it's been nice, because I have an objective measure of my cognitive decline from being tired that I wouldn't have seen otherwise, and it's made me want to go to bed so that I'm not tanking my puzzle rating on Lichess, haha. :)