AlphaZero has been used to more objectively study chess variants in this paper: https://arxiv.org/pdf/2009.04374.pdf https://arxiv.org/pdf/2009.04374.pdf I don

AlphaZero has been used to more objectively study chess variants in this paper: https://arxiv.org/pdf/2009.04374.pdf https://arxiv.org/pdf/2009.04374.pdf I don't think they mention anything about speeding up training. The original training time for AlphaZero was only a few hours anyway so I don't think that was ever a major constraint. I would imagine that each neural network performed best on the variant on which it was trained.