Abstract
We describe the application of a physics-inspired renormalization technique to combinatorial games. Although this approach is not rigorous, it allows one to calculate detailed, probabilistic properties of the geometry of the P-positions in a game. The resulting geometric insights provide explanations for a number of numerical and theoretical observations about various games that have appeared in the literature. This methodology also provides a natural framework for several new avenues of research in combinatorial games, including notions of “universality,” “sensitivity-to-initial-conditions,” and “crystal-like growth,” and suggests surprising connections between combinatorial games, nonlinear dynamics, and physics. We demonstrate the utility of this approach for a variety of games— three-row Chomp, 3-D Wythoff’s game, Sprague–Grundy values for 2-DWythoff’s game, and Nim and its generalizations—and show how it explains existing results, addresses longstanding questions, and generates new predictions and insights.
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