Qualitative Reachability in Stochastic BPA Games
We consider a class of infinite-state stochastic games generated by stateless pushdown automata (or, equivalently, 1-exit recursive state machines), where the winning objective is specified by a regular set of target configurations and a qualitative probability constraint `${>}0$' or `${=}1$'. The goal of one player is to maximize the probability of reaching the target set so that the constraint is satisfied, while the other player aims at the opposite. We show that the winner in such games can be determined in $\textbf{NP} \cap \textbf{co-NP}$. Further, we prove that the winning regions for both players are regular, and we design algorithms which compute the associated finite-state automata. Finally, we show that winning strategies can be synthesized effectively.
Stochastic games
Reachability
Pushdown automata
207-218
Regular Paper
Tomas
Brazdil
Tomas Brazdil
Vaclav
Brozek
Vaclav Brozek
Antonin
Kucera
Antonin Kucera
Jan
Obdrzalek
Jan Obdrzalek
10.4230/LIPIcs.STACS.2009.1837
Creative Commons Attribution-NoDerivs 3.0 Unported license
https://creativecommons.org/licenses/by-nd/3.0/legalcode