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an early chess program by [[Johann Joss]], who already started chess programming in 1967 on a [https://en.wikipedia.org/wiki/CDC_1604 [CDC I604 1604|CDC 1604 A]] <ref>[https://www.computerwoche.de/a/computer-logik-im-koeniglichen-spiel,1205123 Erstes Computer-Schachturnier der Gesellschaft für Informatik], October 17, 1975, [[Computerworld#Woche|Computerwoche]] 42/1975 (German)</ref>. It played the first two [[World Computer Chess Championship|World Computer Chess Championships]], the [[WCCC 1974]] in [https://en.wikipedia.org/wiki/Stockholm Stockholm] and the [[WCCC 1977]] in [https://en.wikipedia.org/wiki/Toronto Toronto], and won the first German computer chess tournament, the [[First GI Computer Chess Tournament]], 1975 in [https://en.wikipedia.org/wiki/Dortmund Dortmund] <ref>[https://www.computerwoche.de/a/tells-geschoss-schachmatt,1205122 Tells Geschoß: Schachmatt], October 17, 1975, [[Computerworld#Woche|Computerwoche]] 42/1975 (German)</ref> <ref>[https://www.computerwoche.de/a/computerschach-mini-besiegt-maxi,1205115 Computerschach: Mini besiegt Maxi], October 17, 1975, [[Computerworld#Woche|Computerwoche]] 42/1975 (German)</ref>. Tell was a small and fast searcher for that time, running on [[HP 2100|HP 2100, HP 2115]] [https://en.wikipedia.org/wiki/Minicomputer minicomputers], three to eight [[Ply|plies]] deep with around 100.000 nodes in three minutes <ref>[[Karsten Bauermeister]] ('''1995'''). ''Aufbruchstimmung in Deutschland.'' [[Computerschach und Spiele]] Heft 6, 1995 (German)</ref>.