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In 1978, Matthias Engelbach started to develop the chess program [[Schach]] in [[Algol]] running on [https://en.wikipedia.org/wiki/Mainframe_computer mainframe computers]
<ref>[http://www.computerhistory.org/chess/full_record.php?iid=doc-431614f6c9575 The Fifteenth ACM Computer Chess Championship, San Francisco California, October 7-9, 1984], [http://archive.computerhistory.org/projects/chess/related_materials/text/3-1%20and%203-2%20and%203-3%20and%204-3.1984_15th_NACCC/1984%20NACCC.062303012.sm.pdf pdf] from [[The Computer History Museum]]</ref>.
According to the a former [https://en.wikipedia.org/wiki/Chessgames.com Chessgames.com] description <ref>[http://www.chessgames.com/perl/chessplayer?pid=64934 The chess games of Schach 2 3] from [https://en.wikipedia.org/wiki/Chessgames.com Chessgames.com]</ref>, Schach '''2.0''' extended a 1970s version of [[Schach (US)|Schach]] by [[Rolf C. Smith]] and [[Franklin D. Ceruti]].
In the early 90s, along with co-author [[Thomas Kreitmair]], Schach '''3.0''' was a complete re-write in [[x86]] (486) [[Assembly|assembly language]] for [[IBM PC|PCs]], to become one of the fastest programs of its time <ref>[https://www.stmintz.com/ccc/index.php?id=222098 Schach 3.0] by [[Vincent Diepeveen]], [[CCC]], April 08, 2002</ref>.
