Multi-layered planar firefighting

Arye Deutsch, Ohad Noy Feldheim, Rani Hod

Research output: Contribution to journalArticlepeer-review


Consider a model of fire spreading through a graph; initially some vertices are burning, and at every given time-step fire spreads from burning vertices to their neighbours. The firefighter problem is a solitaire game in which a player is allowed, at every time-step, to protect some non-burning vertices (by effectively deleting them) in order to contain the fire growth. How many vertices per turn, on average, must be protected in order to stop the fire from spreading infinitely? Here we consider the problem on Z2×[h] for both nearest neighbour adjacency and strong adjacency. We determine the critical protection rates for these graphs to be 1.5h and 3h, respectively. This establishes the fact that using an optimal two-dimensional strategy for all layers in parallel is asymptotically optimal.

Original languageEnglish
Article number113103
JournalDiscrete Mathematics
Issue number12
StatePublished - Dec 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.


Research supported by Len Blavatnik and the Blavatnik Family foundation .

FundersFunder number
Blavatnik Family Foundation


    • Firefighter problem
    • Infinite graphs
    • Solitaire game


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