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a function that determines the bit-index of the least significant 1 [[Bit|bit]] ([[General Setwise Operations#TheLeastSignificantOneBitLS1B|LS1B]]) or the most significant 1 [[Bit|bit]] ([[General Setwise Operations#TheMostSignificantOneBitMS1B|MS1B]]) in an integer such as [[Bitboards|bitboards]]. If exactly one bit is set in an unsigned integer, representing a numerical value of a [https://en.wikipedia.org/wiki/Power_of_two power of two], this is equivalent to a [https://en.wikipedia.org/wiki/Binary_logarithm base-2 logarithm]. Many implementations have been devised since the advent of bitboards, as described on this page, and some [[BitScan#EngineSamples|implementation samples]] of concrete [[:Category:Open Source Engines|open source engines]] listed for didactic purpose.