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Qualitative reachability in stochastic BPA games. (English) Zbl 1237.91035
Summary: 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 $$P$$ for the “$$>0$$” constraint, and in $$\mathbf {NP} \cap \mathbf {co}-\mathbf {NP}$$ for the “$$=1$$” constraint. 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.

##### MSC:
 91A15 Stochastic games, stochastic differential games 68Q15 Complexity classes (hierarchies, relations among complexity classes, etc.)
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