How do you tell if a computer game is being played by a human or a computer?
Trackmania allows you to replay every keystroke. Enthusiasts have reverse engineered the game and measured what the fastest possible inputs are possible by hand!
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Since AlphaZero isn't open source, a group of enthusiasts have written a public project Leela Chess Zero based on the paper. When new versions of the paper come out, they are able to refine their implementation!