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a Serbian professor of [https://en.wikipedia.org/wiki/Semantics semantics] and [[Cognition|cognitive science]] at the [https://en.wikipedia.org/wiki/University_of_Ni%C5%A1 University of Niš]. Đorđe Vidanović is a computer chess expert, early supporter of the [[Chess Engine Communication Protocol]] protocol and [[:Category:WinBoard Engines|WinBoard Engines]], and the [[:Category:Opening Book AuthorsAuthor|opening book author]] of various chess engines, beside others, notably for [[Ruffian]] and early [[Rybka]] versions <ref>[https://www.stmintz.com/ccc/index.php?id=473907 Rybka opening book (Paderborn and beyond)] by [[Vasik Rajlich]], [[Computer Chess Forums|CCC]], December 27, 2005</ref> <ref>[http://www.rybkachess.com/deutsch/index.php?auswahl=FAQ+zur+Beta Rybka 1.0 Beta FAQ]</ref> , and along with primary author [[Vladan Vučković]] co-author of chess engine [[Axon]], and also involved in its parallel incarnation [[Achilles]], responsible for the book moves <ref>[http://chess.elfak.ni.ac.yu/ Achilles Home]</ref> .