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One-Dimensional Peg Solitaire, and Duotaire


  • Cristopher Moore
  • David Eppstein


We solve the problem of one-dimensional Peg Solitaire. In particular, we show that the set of configurations that can be reduced to a single peg forms a regular language, and that a linear-time algorithm exists for reducing any configuration to the minimum number of pegs. We then look at the impartial two-player game, proposed by Ravikumar, where two players take turns making peg moves, and whichever player is left without a move loses. We calculate some simple nim-values and discuss when the game separates into a disjunctive sum of smaller games. In the version where a series of hops can be made in a single move, we show that neither the $\cal P$-positions nor the $\cal N$-positions (i.e. wins for the previous or next player) are described by a regular or context-free language.

Suggested Citation

  • Cristopher Moore & David Eppstein, 2000. "One-Dimensional Peg Solitaire, and Duotaire," Working Papers 00-09-050, Santa Fe Institute.
  • Handle: RePEc:wop:safiwp:00-09-050

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