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a chess program developed by a group of students from [[Delft University of Technology|Delft Institute of Technology]]. [[Jan Derksen]], [[Harry Nefkens]] and [[Jaap van den Herik]] started the development in 1979, [[Sito Dekker]], [[Roger Hünen]], [[Gerlach van Beinum]] and [[John Huisman]] joined the team later <ref>[[Peter van Diepen]] ('''1983'''). ''Toernooibulletin van het Nederlands kampioenschap computerschaak 1982''. [http://www.schaakcomputers.nl/hein_veldhuis/database/files/05-1983,%20toernooibulletin%20van%20het%20Nederlands%20kampioenschap%20computerschaak%201982.pdf pdf] hosted by [[Hein Veldhuis]] » [[DOCCC 1982]]</ref> <ref>[[Ben Mittman]] ('''1983'''). ''ACM's Thirteenth North American Computer Chess Championship''. [[ICGA Journal#6_1|ICCA Newletter, Vol. 6, No. 1]] » [[ACM 1982]]</ref> <ref>[http://www.computerhistory.org/chess/full_record.php?iid=doc-431614f6c8af8 The Fourth World Computer Chess Championship] (labeled 22nd ACM), [http://archive.computerhistory.org/projects/chess/related_materials/text/3-1%20and%203-2%20and%203-3%20and%204-3.1983_WCCC/1983-%20WCCC.062303061.sm.pdf pdf] from [[The Computer History Museum]], [http://www.sci.brooklyn.cuny.edu/%7Ekopec/Publications/Publications/O_36_C.pdf pdf] from [[Danny Kopec]]</ref>. Written in the [[C]] programming language, Pion had an [[Opening Book|opening book]] of 4000 positions in 1983, when it searched about 1K [[Nodes per secondSecond|nodes per second]] <ref>[http://www.computerhistory.org/chess/full_record.php?iid=doc-431614f6c8af8 The Fourth World Computer Chess Championship] (labeled 22nd ACM), [http://archive.computerhistory.org/projects/chess/related_materials/text/3-1%20and%203-2%20and%203-3%20and%204-3.1983_WCCC/1983-%20WCCC.062303061.sm.pdf pdf] from [[The Computer History Museum]], [http://www.sci.brooklyn.cuny.edu/%7Ekopec/Publications/Publications/O_36_C.pdf pdf] from [[Danny Kopec]]</ref>.