The Curvature Shadow: An Apparent Failure of Maximum-Entropy Equilibrium Selection is a Removable Artifact
A new preprint investigates why regularized solvers like R-NaD, which typically select the maximum-entropy Nash equilibrium in two-player zero-sum games, appear to deviate in the case of Kuhn poker. The authors show that the observed gap is explained by a quantitative relationship involving entropy shortfall and curvature, and that the gap vanishes as the entropy shortfall approaches zero. This demonstrates that the deviation is not a fundamental bias but a removable artifact due to the curvature of the entropy landscape.
Why it matters: This work resolves a notable exception to maximum-entropy equilibrium selection, reinforcing the reliability of regularized solvers in game-theoretic analysis.
Full story at: arXiv Multiagent Systems ↗