We study natural strategic games on directed graphs, which capture the idea of coordination in the absence of globally common strategies. We show that these games do not need to have a pure Nash equilibrium and that the problem of determining their existence is NP-complete. The same holds for strong equilibria. We also exhibit some classes of games for which strong equilibria exist and prove that a strong equilibrium can then be found in linear time.

Electronic Proceedings in Theoretical Computer Science
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Apt, K.R, Simon, S.E, & Wojtczak, D.K. (2016). Coordination games on directed graphs. In Electronic Proceedings in Theoretical Computer Science. doi:10.4204/EPTCS.215.6