Patrolling a border

Katerina Papadaki, Steve Alpern, Thomas Lidbetter, Alec Morton

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Patrolling games were recently introduced to model the problem of protecting the nodes of a network from an attack. Time is discrete and in each time unit the Patroller can stay at the same node or move to an adjacent node. The Attacker chooses when to attack and which node to attack and needs m consecutive time units to carry it out. The Attacker wins if the Patroller does not visit the chosen node while it is being attacked; otherwise, the Patroller wins. This paper studies the patrolling game where the network is a line graph of n nodes, which models the problem of guarding a channel or protecting a border from infiltration. We solve the patrolling game for any values of m and n, providing an optimal Patroller strategy, an optimal Attacker strategy, and the value of the game (optimal probability that the attack is intercepted).

Original languageEnglish (US)
Pages (from-to)1256-1269
Number of pages14
JournalOperations Research
Issue number6
StatePublished - Nov 1 2016

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Management Science and Operations Research


  • Patrolling
  • Search and surveillance


Dive into the research topics of 'Patrolling a border'. Together they form a unique fingerprint.

Cite this