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Spartan's way using the [https://en.wikipedia.org/wiki/Euclidean_distance Euclidean distance] with [[Double|double]] arithmetic due to [https://en.wikipedia.org/wiki/C_standard_library C standard library] [https://en.wikipedia.org/wiki/Square_root square root] (double sqrt(double)) <ref>[https://github.com/christiandaley/Spartan/blob/master/src/eval.h partan/eval.h at master · christiandaley/Spartan · GitHub], #define DIST(sq1, sq2) ((int)sqrt(((...</ref>
<ref>[https://www.programiz.com/c-programming/library-function/math.h/sqrt C sqrt() - C Standard Library]</ref>, as used in calculating [[King Pawn Tropism|king passer tropism]],
is expensive and rarely seen in chess programs. Recommended is [[Distance#Lookup|looking up]] the [[Distance|Chebyshev distance]] or [[Manhattan-Distance|Manhattan distance]] for that purpose.
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