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I like chess because it takes up all my brain cycles in a way similar to PoW mining taking up excess power on the grid. Chess helps me to stop thinking (about anything else other than chess). Chess is, in and of itself, for me at least, a complete waste of time. And that's why I like it. It's pure play. And I like to play. I'm too old to play soccer now, so chess is a good substitute. When I'm playing i'm totally absorbed, and I don't need to worry about quantum computers or the Straight of Hormuz. So, for me, chess is the opposite of "intellectual". I may as well be playing Candy Crush. Chess is a very good PoW algorithm, though, imo. It is impossible to exhaust one's knowledge of it, or even get close to understanding 0.1% of it. But for some reason, one is compelled to try..