We study two-player games on finite graphs. Turn-based games have many nice properties, but concurrent games are harder to tame: e.g. turn-based stochastic parity games have positional optimal strategies, whereas even basic concurrent reachability games may fail to have optimal strategies. We study concurrent stochastic parity games, and identify a local structural condition that, when satisfied at each state, guarantees existence of positional optimal strategies for both players.
@InProceedings{bordais_et_al:LIPIcs.CSL.2024.18, author = {Bordais, Benjamin and Bouyer, Patricia and Le Roux, St\'{e}phane}, title = {{From Local to Global Optimality in Concurrent Parity Games}}, booktitle = {32nd EACSL Annual Conference on Computer Science Logic (CSL 2024)}, pages = {18:1--18:21}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-310-2}, ISSN = {1868-8969}, year = {2024}, volume = {288}, editor = {Murano, Aniello and Silva, Alexandra}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2024.18}, URN = {urn:nbn:de:0030-drops-196612}, doi = {10.4230/LIPIcs.CSL.2024.18}, annote = {Keywords: Game forms, stochastic games, parity games, Blackwell/Martin values} }
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