An Analysis of UCT in Multi-player Games

  • Authors:
  • Nathan R. Sturtevant

  • Affiliations:
  • Department of Computing Science, University of Alberta, Edmonton, Canada T6G 2E8

  • Venue:
  • CG '08 Proceedings of the 6th international conference on Computers and Games
  • Year:
  • 2008

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Abstract

The UCT algorithm has been exceedingly popular for Go, a two-player game, significantly increasing the playing strength of Go programs in a very short time. This paper provides an analysis of the UCT algorithm in multi-player games, showing that UCT, when run in a multi-player game, is computing a mixed-strategy equilibrium, as opposed to maxn, which computes a pure-strategy equilibrium. We analyze the performance of UCT in several known domains and show that it performs as well or better than existing algorithms.