Geodesic
An Algorithm for the Detection of Move Repetition Without the Use of Hash-Keys
Yugoslav journal of operations research, Tome 17 (2007) no. 2, p. 257 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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This paper addresses the theoretical and practical aspects of an important problem in computer chess programming – the problem of draw detection in cases of position repetition. The standard approach used in the majority of computer chess programs is hash-oriented. This method is sufficient in most cases, as the Zobrist keys are already present due to the systemic positional hashing, so that they need not be computed anew for the purpose of draw detection. The new type of the algorithm that we have developed solves the problem of draw detection in cases when Zobrist keys are not used in the program, i.e. in cases when the memory is not hashed.
Classification : 68W05 91A46
Keywords: Theory of games, algorithms in computer chess, repetition detection. 
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     title = {An {Algorithm} for the {Detection} of {Move} {Repetition} {Without} the {Use} of {Hash-Keys}},
     journal = {Yugoslav journal of operations research},
     pages = {257 },
     year = {2007},
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     zbl = {1274.68677},
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Vladan Vučković; Đorđe Vidanović. An Algorithm for the Detection of Move Repetition Without the Use of Hash-Keys. Yugoslav journal of operations research, Tome 17 (2007) no. 2, p. 257 . http://geodesic.mathdoc.fr/item/YJOR_2007_17_2_a8/