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An Alternative Efficient Chessboard Representation Based on 4-Bit Piece Coding
Yugoslav journal of operations research, Tome 22 (2012) no. 2, p. 265 .

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his paper describes theoretical and practical aspects of an alternative efficient chessboard representation based on 4-bit piece coding technique. There are two main approaches used by the majority of computer chess programs: arrays and bitboards. However, after the years of researching and experimenting in chess engine Axon and its parallel version Achilles, we would like to introduce an alternative chessboard representation C. C. R. (Compact Chessboard Representation) based on a new coding technique that performs very well both on 32-bit and 64-bit hardware platforms.
Keywords: Computer chess, Chess engines, Data structures, Chessboard representation. 
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Vladan Vučković. An Alternative Efficient Chessboard Representation Based on 4-Bit Piece Coding. Yugoslav journal of operations research, Tome 22 (2012) no. 2, p. 265 . http://geodesic.mathdoc.fr/item/YJOR_2012_22_2_a6/