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In 1979, following the development of the original Boris when more advanced programs were required, [[Arleen Chafitz|Arleen]] and [[Steve Chafitz]] contracted [[Kathe Spracklen|Kathe]] and [[Dan Spracklen]] to be their chess programmers for their [[Chafitz Modular Game System|Chafitz modular game system]] as well the [[Applied Concepts]] [[Great Game Machine]] <ref>[http://www.great-game-machine.com/ Welcome to the Great-Game Machine Workshop]</ref>. Their [[Sargon|Sargon 2.5]] program appeared as ''Chafitz Sargon 2.5'' MGS [[Module|module]] <ref>[http://www.schach-computer.info/wiki/index.php/Chafitz_Sargon_2.5 Chafitz Sargon 2.5] from [http://www.schach-computer.info/wiki/index.php/Hauptseite_En Schachcomputer.info Wiki] (German)</ref>, and in 1980, as [[Chafitz ARB Sargon 2.5]] <ref>[http://www.spacious-mind.com/html/arb_sargon_2_5.html Chafitz ARB Sargon 2.5 Electronic Chess Computer] from [[The Spacious Mind]]</ref>, also called ''Boris Sargon 2.5'' <ref>[http://tluif.home.xs4all.nl/chescom/BorSarg.html Boris Sargon 2.5] by [http://www.xs4all.nl/%7Etluif/ [Tom Luif]]</ref> or simply dubbed ''Boris 2.5''. [[John Aker]] and [[Terry Fredrick]], affiliated with Applied Concepts, were involved in improving the Sargon and Boris program <ref>terryfrederick.com/resume.htm as of 2018 dead link</ref>.