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Enhanced Realization Probability Search

Author

Listed:
  • MARK H. M. WINANDS

    (MICC-IKAT Games and AI Group, Faculty of Humanities and Sciences, Universiteit Maastricht, P.O. Box 616 6200MD Maastricht, The Netherlands)

  • YNGVI BJÖRNSSON

    (School of Computer Science, Reykjavík University, Ofanleiti 2 IS-103 Reykjavík, Iceland)

Abstract

In this paper, we show that Realization Probability Search (RPS) significantly improves the playing strength of a world-class Lines-of-Action (LOA) computer program, even when used in combination with existing state-of-the-artαβsearch enhancements. In a 600-game match, a RPS-based version of the program defeats the original one with a winning score of 62.5%. The main contribution of the paper, however, is the introduction of a much improved variant of RPS, called Enhanced Realization Probability Search (ERPS). The new algorithm addresses two weaknesses of RPS and overcomes them by using a better focussed re-searching scheme, resulting in both more robust tactical play and reduced search overhead. Our experiments in the domain of LOA show that ERPS offers just as a significant improvement over regular RPS, as the latter improves upon regular search. More specifically, the ERPS-based variant scores 62.1% against the RPS variant, and an impressive 72.2% score against the original program. This represents an improvement of over 100 ELO points over the original state-of-the-art player.

Suggested Citation

  • Mark H. M. Winands & Yngvi Björnsson, 2008. "Enhanced Realization Probability Search," New Mathematics and Natural Computation (NMNC), World Scientific Publishing Co. Pte. Ltd., vol. 4(03), pages 329-342.
    • Handle: RePEc:wsi:nmncxx:v:04:y:2008:i:03:n:s1793005708001070
    DOI: 10.1142/S1793005708001070
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    Cited by:

    1. Cevahir Uzkurt & Rachna Kumar & Halil Semih Kimzan & Hanife Sert, 2012. "THE IMPACT OF ENVIRONMENTAL UNCERTAINTY DIMENSIONS ON ORGANISATIONAL INNOVATIVENESS: AN EMPIRICAL STUDY ON SMEs," International Journal of Innovation Management (ijim), World Scientific Publishing Co. Pte. Ltd., vol. 16(02), pages 1-23.
    2. Stephanie C. Schleimer & Arthur D. Shulman, 2011. "When Intra-Firm And Inter-Firm Collaborations Co-Occur: Comparing Their Impact Across New Services Versus New Product Innovations," International Journal of Innovation Management (ijim), World Scientific Publishing Co. Pte. Ltd., vol. 15(05), pages 869-898.

    More about this item

    Keywords

    Search; heuristics; games;
    All these keywords.

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