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OpenSpiel 2.0 by Google DeepMind adds LLM fine-tuning examples, MCP tool server, JSON trajectories, AlphaZero on JAX, 19 new games, and Windows support.

Chess and Go have been conquered by AI, but imperfect information games with hidden data are the true frontier. This article dives deep into Tactico: how imitation learning + self-play RL train AI toward Nash equilibrium.