Stochastic timed games (STGs), introduced by Bouyer and Forejt, generalize continuous-time Markov chains and timed automata. Depending on the number of players - 2, 1, or 0 - subclasses of stochastic timed games are classified as 2½-player, 1½-player, and ½-player games where the ½ symbolizes the presence of the stochastic player. The qualitative and quantitative reachability problem for STGs was studied in [Patricia Bouyer and Vojtech Forejt, 2009] and [S. Akshay et al., 2016]. In this paper, we introduce stochastic stopwatch games (SSG), an extension of (STG) from clocks to stopwatches. We focus on 1½-player SSGs and prove that with two variables which can be either a clock or a stopwatch, qualitative reachability is decidable, whereas, if we increase the number of variables to three, with at least one stopwatch, the problem becomes undecidable.
@InProceedings{roychowdhury:LIPIcs.TIME.2021.17, author = {Roychowdhury, Sparsa}, title = {{1½-Player Stochastic StopWatch Games}}, booktitle = {28th International Symposium on Temporal Representation and Reasoning (TIME 2021)}, pages = {17:1--17:18}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-206-8}, ISSN = {1868-8969}, year = {2021}, volume = {206}, editor = {Combi, Carlo and Eder, Johann and Reynolds, Mark}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TIME.2021.17}, URN = {urn:nbn:de:0030-drops-147934}, doi = {10.4230/LIPIcs.TIME.2021.17}, annote = {Keywords: Timed Automata, Stopwatches, Stochastic Timed Games} }
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