Changes

* [http://drpetric.blogspot.com/2013/09/bit-gathering-via-multiplication.html Bit Gather Via Multiplication] by [[Vlad Petric]], [http://drpetric.blogspot.com/ Dr. Petric's Technical Blog], September 17, 2013 <ref>[https://web.archive.org/web/20180820032914/https://chessprogramming.wikispaces.com/share/view/64439740 Demystifying the Magic Multiplier?]([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine], August 20, 2018)</ref>