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Ataraxos AI defeats top-ranked Stratego player Pim Niemeijer 15-1

Researchers from Carnegie Mellon, MIT, NYU and Stanford built an AI called Ataraxos that beat Pim Niemeijer, widely regarded as the best Stratego player ever, 15 games to one with four draws. The system was trained using just 16 GPUs and a few thousand dollars, a tiny fraction of what projects like DeepMind's earlier Stratego attempts required.

arstechnica.com · 2026-10-01

DeepMind details Ataraxos, an AI system built for Stratego's hidden-information gameplay

Researchers describe Ataraxos, a decision-making system for the imperfect-information board game Stratego. It combines two interdependent self-play reinforcement learning processes—one for choosing piece set-ups, one for choosing moves—built on transformer networks, alongside a belief network trained on self-play games and a search procedure used at test time.

nature.com · 2026-09-30