MCGS
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shindavid commented
Implement Monte Carlo Graph Search (MCGS). Basically, if two different sequences of moves transpose to the same position, they can share the same MCTS Node.
According to a post in the Leela Chess Zero discord, this is the main MCGS paper:
https://arxiv.org/pdf/2012.11045.pdf
The details are a bit hairy. As of Jan 2023, Leela Chess Zero does not yet incorporate MCGS into their master branch. KataGo does use MCGS.