Home/Events/Ataraxos AI Beats Best Stratego Player Pim Niemeijer 15-1

Ataraxos AI Beats Best Stratego Player Pim Niemeijer 15-1

Confirmed

Confidence

90%

Impact: 80%

Updated 1h ago

Consensus Brief

A team of researchers from Carnegie Mellon, MIT, New York University, and Stanford developed an AI named Ataraxos that defeated Pim Niemeijer, the best Stratego player in history, in a series of 20 games. Ataraxos achieved a score of 15 wins, 1 loss, and 4 draws, utilizing only 16 GPUs and a few thousand dollars for training.

Sourced from

Ars TechnicaT2

Primary: Ars Technica

What Changed Since Last Update

1h ago

Ataraxos introduced a belief model to estimate opponents' hidden pieces and employed a unique strategy adjustment method during training, which previous AIs like DeepMind's DeepNash did not utilize.

Claim Ledger

4 claims tracked across sources

Confirmed Fact

Ataraxos beat Pim Niemeijer 15 games to 1 with 4 draws.

Confirmed Fact

Ataraxos was trained using 16 GPUs and a few thousand dollars.

Confirmed Fact

Ataraxos played 163 million self-play games.

Confirmed Fact

Ataraxos won 38 of 40 games at the 2025 Stratego World Championship.

Role-Based Impact Analysis

Source Timeline

1 source corroborating

AI finally beat the best Stratego player in history—and did it on a budget

Ars Technica·1h ago