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a German chess programmer and chess player<ref>[http://www.schachklub-durlach.de/node/416 Ahnengalerie | Schachklub Durlach - Die Zweite 1996], [https://en.wikipedia.org/wiki/Durlach Durlach from Wikipedia]</ref>, along with [[Ernst A. Heinz]] and [[Peter Gillgasch]], author of the computer chess program [[DarkThought]]. Beside programming on DarkThought, Markus was also responsible of its [[Opening Book|opening book]] - and represented and operated DarkThought at various tournaments.