Exercises on lichess are one of my favorite ways to kill time. Haven’t played a real game in years but I love the low pressure of running through little scenarios, even if I can’t always grasp why the computer thinks a particular line is optimal lol

(And you can do a bunch of them offline)

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I had a local paper do this to me a few years ago. Turns out I can ask my credit card provider to block payments to them at 2am on a Saturday and I still get access to the paper for another two months.