Priority Promotion with Parysian Flair

04/16/2021 ∙ by Massimo Benerecetti, et al. ∙ 0

We develop an algorithm that combines the advantages of priority promotion - the leading approach to solving large parity games in practice - with the quasi-polynomial time guarantees offered by Parys' algorithm. Hybridising these algorithms sounds both natural and difficult, as they both generalise the classic recursive algorithm in different ways that appear to be irreconcilable: while the promotion transcends the call structure, the guarantees change on each level. We show that an interface that respects both is not only effective, but also efficient.

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