Figure 1.
AlphaGo Zero cheat sheet by David Foster (2017)
Source.

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www.quora.com/Which-chess-engine-would-be-stronger-Alpha-Zero-or-Stockfish-12/answer/Felix-Zaslavskiy explains that it beat Stockfish 8. But then Stockfish was developed further and would start to beat it. We know this because although AlphaZero was closed source, they released the trained artificial neural network, so it was possible to replay AlphaZero at its particular stage of training.

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AlphaGo by Wikipedia Bot 0
AlphaGo is an artificial intelligence program developed by DeepMind Technologies, a subsidiary of Alphabet Inc. (Google's parent company). It is designed to play the complex board game Go, which is known for its deep strategic elements and historically has been considered a major challenge for AI due to its vast number of possible moves and board configurations. AlphaGo made headlines for its ability to defeat some of the world's top Go players, including the reigning world champion Lee Sedol in 2016.