h playouts (or <em>rollouts</em>), the search can get a feel for how good a position is, based on potential outcomes. However, what people often do not realize (understandably) about AlphaGo, AlphaGo Zero and AlphaZero is that their MCTS implementations are deterministic until sampling and multi-threading are introduced. <a href="https://storage.googleapis.com/deepmind-media/alphago/AlphaGoNaturePaper.pdf">AlphaGo (Silver et al., 2016)</a> uses a trained <em>fast rollout policy</em> (in combination with a v