Similarity pruning in PrOM search

  • Authors:
  • H. (Jeroen) H. L. M. Donkers;H. Jaap van den Herik;Jos W. H. M. Uiterwijk

  • Affiliations:
  • Institute for Knowledge and Agent Technology, MICC, Universiteit Maastricht, Maastricht, The Netherlands;Institute for Knowledge and Agent Technology, MICC, Universiteit Maastricht, Maastricht, The Netherlands;Institute for Knowledge and Agent Technology, MICC, Universiteit Maastricht, Maastricht, The Netherlands

  • Venue:
  • ACG'05 Proceedings of the 11th international conference on Advances in Computer Games
  • Year:
  • 2006

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Abstract

In this paper we introduce a new pruning mechanism, called Similarity Pruning for Probabilistic Opponent-Model (PrOM) Search. It is based on imposing a bound on the differences between two or more evaluation functions. Assuming such a bound exists, we are able to prove two theoretical properties, viz., the bound-conservation property and the bounded-gain property. Using these properties we develop a Similarity-Pruning algorithm. Subsequently we conduct a series of experiments on random game trees to measure the efficiency of the new algorithm. The results show that Similarity Pruning increases the efficiency of PrOM search considerably.