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a German computer scientist, chessplayer <ref>[http://ratings.fide.com/card.phtml?event=4608631 Schruefer, Guenther, Dr. FIDE Chess Profile]</ref> and former computer chess programmer. He defended his M.Sc. on modeling [[Search Tree|Search Trees]] in Chess 1983 <ref>[[Günther Schrüfer]] ('''1983'''). Ein Modell für den Spielbaum beim Schach : Implementierung und Vergleich mit anderen Modellen. Braunschweig : TU</ref> and his Ph.D. on costs, qality and algorithms of [[Minimax|minimax search]] in 1988 <ref>[[Günther Schrüfer]] ('''1988'''). ''Minimax-Suchen : Kosten, Qualität und Algorithmen''. [https://en.wikipedia.org/wiki/Technical_University_of_Braunschweig TU Braunschweig] (German)</ref> at the [https://en.wikipedia.org/wiki/Technical_University_of_Braunschweig Technical University of Braunschweig]. In his 1988 paper ''Root Evaluation Errors: How they Arise and Propagate'' <ref>[[Ingo Althöfer]] ('''1988'''). ''Root Evaluation Errors: How they Arise and Propagate''. [[ICGA Journal#11_23|ICCA Journal, Vol. 11, Nos. 2/3]]</ref>, [[Ingo Althöfer]] used Schrüfer's model limited to regular binary two-valued trees of depth n, to demonstrate how root errors arose.

Along with [[Hans-Joachim Kraas]], Günther Schrüfer is co-author of the chess programs [[Bobby]], Bobby II and [[Doctor?]] <ref>[http://www.ajedrez-de-estilo.com.ar/int/Products/engines/doctor/index.htm Doctor? by Dr. Hans-Joachim Kraas and Dr. Gunther Schrüfer]</ref> <ref>[http://scleinzell.schachvereine.de/p_spielprogramme/fritz532.shtml Fritz 5.32 - mehr als nur ein Update!] by [[Peter Schreiner]] (German), [http://scleinzell.schachvereine.de/home/news.shtml Schachclub Leinzell]</ref> <ref>[http://www.schachversand.de/d/detail/software/76.html Doctor? 2.0 / Engine MacIntosh] from [[Schachversand Niggemann]]</ref> . He is co-author of ''Das große Computerschachbuch'' (German), describing chess programming topics, and the didactic chess program [[Demoschach]] written in [[Basic]].