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The Exact Query Complexity of Yes-No Permutation Mastermind

1
Polydisciplinary Faculty Ouarzazate, University Ibn Zohr, Agadir 80000, Morocco
2
Department of Mathematics, Kiel University, 24118 Kiel, Germany
*
Author to whom correspondence should be addressed.
Games 2020, 11(2), 19; https://doi.org/10.3390/g11020019
Received: 14 February 2020 / Revised: 30 March 2020 / Accepted: 4 April 2020 / Published: 13 April 2020
Mastermind is famous two-player game. The first player (codemaker) chooses a secret code which the second player (codebreaker) is supposed to crack within a minimum number of code guesses (queries). Therefore, the codemaker’s duty is to help the codebreaker by providing a well-defined error measure between the secret code and the guessed code after each query. We consider a variant, called Yes-No AB-Mastermind, where both secret code and queries must be repetition-free and the provided information by the codemaker only indicates if a query contains any correct position at all. For this Mastermind version with n positions and k n colors and : = k + 1 n , we prove a lower bound of j = k log 2 j and an upper bound of n log 2 n + k on the number of queries necessary to break the secret code. For the important case k = n , where both secret code and queries represent permutations, our results imply an exact asymptotic complexity of Θ ( n log n ) queries. View Full-Text
Keywords: Mastermind; permutation; query complexity Mastermind; permutation; query complexity
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  • Externally hosted supplementary file 1
    Doi: 10.5281/zenodo.3723659
    Description: GitHub repositry "yn-ab-mastermindv1.0": Codebreaker strategies for Yes-No AB-Mastermind (Matlab/Octave)
MDPI and ACS Style

El Ouali, M.; Sauerland, V. The Exact Query Complexity of Yes-No Permutation Mastermind. Games 2020, 11, 19.

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