Three-player nim with podium rule

Richard J. Nowakowski (), Carlos P. Santos () and Alexandre M. Silva ()
Additional contact information
Richard J. Nowakowski: Dalhousie University
Carlos P. Santos: ISEL-IPL, University of Lisbon
Alexandre M. Silva: University of Minho

International Journal of Game Theory, 2021, vol. 50, issue 3, No 3, 623-633

Abstract: Abstract If a combinatorial game involves more than two players, the problem of coalitions arises. To avoid the problem, Shuo-Yen Robert Li analyzed three-player nim with the podium rule, that is, if a player cannot be last, he should try to be last but one. With that simplification, he proved that a disjunctive sum of nim piles is a $${\mathcal {P}}$$ P -position if and only if the sum modulo 3 of the binary representations of the piles is equal to zero. In this paper, we extend the result in order to understand the complete characterization of the outcome classes, the possible reductions of the game forms, the equivalence classes under the equality of games and related canonical forms.

Keywords: Combinatorial game theory; Impartial games; nim; Three-player games; Podium rule (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s00182-019-00702-3

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