We study the game Greedy Spiders, a two-player strategic defense game, on planar graphs and show PSPACE-completeness for the problem of deciding whether one player has a winning strategy for a given instance of the game. We also generalize our results in metatheorems, which consider a large set of strategic defense games. We achieve more detailed complexity results by restricting the possible strategies of one of the players, which leads us to Sigma^p_2- and Pi^p_2-hardness results.
@InProceedings{dehaan_et_al:LIPIcs.FUN.2018.17, author = {de Haan, Ronald and Wolf, Petra}, title = {{Restricted Power - Computational Complexity Results for Strategic Defense Games}}, booktitle = {9th International Conference on Fun with Algorithms (FUN 2018)}, pages = {17:1--17:14}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-067-5}, ISSN = {1868-8969}, year = {2018}, volume = {100}, editor = {Ito, Hiro and Leonardi, Stefano and Pagli, Linda and Prencipe, Giuseppe}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.FUN.2018.17}, URN = {urn:nbn:de:0030-drops-88082}, doi = {10.4230/LIPIcs.FUN.2018.17}, annote = {Keywords: Computational complexity, generalized games, metatheorems} }
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