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What is the search depth of AlphaGo and AlphaGo Zero?

Artificial Intelligence Asked on December 15, 2020

I cannot find reliable sources but someone says it is 40 moves and someone else says it is 50+ moves. I read their papers and they use value function (NN) and policy function to trim the tree, so more layers can be searched while spending less time searching less different positions.

My question is, is the search depth a fixed preset parameter? If so, approximately how much is it back to 2016 (AlphaGo) and 2018 (AlphaGo Zero)?

One Answer

For easier visualization, I recommend this video: https://twitter.com/i/status/1257053365424578565

The more detailed article about GO algorithms: https://deepmind.com/blog/article/alphago-zero-starting-scratch.

With its breadth of $250$ possible moves each turn (go is played on a $19$ by $19$ board, compared to the much smaller $8$ by $8$ chess field) and a typical game depth of $150$ moves, there are about $250^{150}$, or $10^{360}$.

After $2$ moves in go, it's $130000$ possible combinations.

Decision tree pruning

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Answered by Piotr Żak on December 15, 2020

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