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On the Computational Complexities of Various Geography Variants

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arxiv 2108.09367 v1 pith:PNIS6GBM submitted 2021-08-20 cs.CC math.CO

On the Computational Complexities of Various Geography Variants

classification cs.CC math.CO
keywords geographycomputationaldetermininggeneralizedvertexcomplexitygamegraph
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Generalized Geography is a combinatorial game played on a directed graph. Players take turns moving a token from vertex to vertex, deleting a vertex after moving the token away from it. A player unable to move loses. It is well known that the computational complexity of determining which player should win from a given position of Generalized Geography is PSPACE-complete. We introduce several rule variants to Generalized Geography, and we explore the computational complexity of determining the winner of positions of many resulting games. Among our results is a proof that determining the winner of a game known in the literature as Undirected Partizan Geography is PSPACE-complete, even when restricted to being played on a bipartite graph.

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