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Sure, examples exist. E.g. Game 6 of Carlsen-Caruana, World Chess Championship 2018: [FEN "5k2/8/5pK1/3B1P1P/3n4/8/3b4/8 w - - 6 67"] Kg6? loses, but no human would have found the refutation. As for games where the exact losing move cannot be found even by the best current engines - I spoke to a correspondence chess expert recently, and I'm confident they ...


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