Strategy-Stealing is Non-Constructive

Greg Bodwin; Ofer Grossman

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arXiv · 1911.06907

Strategy-Stealing is Non-Constructive

Greg Bodwin·Ofer Grossman

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Abstract

In many combinatorial games, one can prove that the first player wins under best play using a simple but non-constructive argument called strategy-stealing. This work is about the complexity behind these proofs: how hard is it to actually find a winning move in a game, when you know by strategy-stealing that one exists? We prove that this problem is PSPACE-hard already for Minimum Poset Games and Symmetric Maker-Maker Games, which are simple classes of games that capture two of the main types of strategy-stealing arguments in the current literature.

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BibTeX RIS

Greg Bodwin, Ofer Grossman. 2019-11-15. Strategy-Stealing is Non-Constructive. https://arxiv.org/abs/1911.06907

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