2026-07-20T07:29:07Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:23959 2025-11-12T13:24:58Z ddc:004 open_access

A Direct Reduction from Stochastic Parity Games to Simple Stochastic Games Berthon, Raphaël Katoen, Joost-Pieter Zhou, Zihan stochastic games parity reduction Significant progress has been recently achieved in developing efficient solutions for simple stochastic games (SSGs), focusing on reachability objectives. While reductions from stochastic parity games (SPGs) to SSGs have been presented in the literature through the use of multiple intermediate game models, a direct and simple reduction has been notably absent. This paper introduces a novel and direct polynomial-time reduction from quantitative SPGs to quantitative SSGs. By leveraging a gadget-based transformation that effectively removes the priority function, we construct an SSG that simulates the behavior of a given SPG. We formally establish the correctness of our direct reduction. Furthermore, we demonstrate that under binary encoding this reduction is polynomial, thereby directly corroborating the known NP ∩ coNP complexity of SPGs and providing new understanding in the relationship between parity and reachability objectives in turn-based stochastic games. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Raphaël Berthon and Joost-Pieter Katoen and Zihan Zhou 2025 Is Part Of LIPIcs, Volume 348, 36th International Conference on Concurrency Theory (CONCUR 2025) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.CONCUR.2025.9 urn:nbn:de:0030-drops-239595 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2025.9 eng https://creativecommons.org/licenses/by/4.0/legalcode