What helps a frozen LLM player more: the opponent's actual strategy, or notes from a memory model trained to write them? MemoPilot trains that memory model with multi-turn GRPO, and the player reads its notes between games. After one game, the notes already beat both the actual strategy and a human counter-strategy written from it, and MemoPilot remains effective when opponent strategies switch. https://benjaminhan.net/posts/20261018-memopilot-memory-rl/?utm_source=mastodon&utm_medium=social #Paper #AI #LLMs #AgenticSystems #RL #ICML #PekingUniversity #ZhipuAI