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We study two-player zero-sum games over infinite-state graphs equipped with omega-B and finitary conditions. Our first contribution is about the strategy complexity, i.e the memory required for winning strategies: we prove that over general infinite-state graphs, memoryless strategies are sufficient for finitary Büchi, and finite-memory suffices for finitary parity games. We then study pushdown games with boundedness conditions, with two contributions. First we prove a collapse result for pushdown games with omega-B-conditions, implying the decidability of solving these games. Second we consider pushdown games with finitary parity along with stack boundedness conditions, and show that solving these games is EXPTIME-complete.
@InProceedings{chatterjee_et_al:LIPIcs.CSL.2013.181,
author = {Chatterjee, Krishnendu and Fijalkow, Nathana\"{e}l},
title = {{Infinite-state games with finitary conditions}},
booktitle = {Computer Science Logic 2013 (CSL 2013)},
pages = {181--196},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-939897-60-6},
ISSN = {1868-8969},
year = {2013},
volume = {23},
editor = {Ronchi Della Rocca, Simona},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2013.181},
URN = {urn:nbn:de:0030-drops-41970},
doi = {10.4230/LIPIcs.CSL.2013.181},
annote = {Keywords: Two-player games, Infinite-state systems, Pushdown games, Bounds in omega-regularity, Synthesis}
}