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The immediate success was the lucky win of the [[WMCCC 1980|1st World Microcomputer Chess Championship]], September 4 to 9, 1980, in London. Chess Challenger with a 6502 CPU, notably winning last three of five rounds against three of four other [[Sargon]] incarnations! While the [[ICGA]] tournament site states a Z80A CPU <ref>[https://www.game-ai-forum.org/icga-tournaments/tournament.php?id=13 1st World Microcomputer Chess Championship - ICGA Tournaments]</ref>, [[Kevin O’Connell]] reported the World Microcomputer Chess Champion was equipped with a [https://en.wikipedia.org/wiki/MOS_Technology MOS Technology] processor, despite newest Fidelity computers were shipped with Z80/Z80A <ref>[[Kevin O’Connell]] ('''1980'''). ''World Microcomputer Chess Championship''. [https://en.wikipedia.org/wiki/Personal_Computer_World Personal Computer World], [http://www.chesscomputeruk.com/html/publication_archive.html November 1980]</ref>. As further confirmed by Fidelity Electronics' Vice President [[Myron Samole]] in an [[Personal Computing#5_1|Personal Computing]] interview, the Champion Sensory Challenger, which also won the [[MCC 1980]] at September 5 to 7 in [https://en.wikipedia.org/wiki/San_Jose,_California San Jose, California] had a program written around the 6502 chip <ref> [[Harry Shershow]] ('''1981'''). ''The MyChess-CSC Confrontation at San Jose''. [[Personal Computing#5_1|Personal Computing, Vol. 5, No. 1]], pp. 79-81</ref>.

[[FILE:ChessChallengerBroschure.jpg|none|border|text-bottom|link=http://www.flickr.com/photos/10261668@N05/859069920/sizes/l/in/photostream/]]

''Chess Challenger Sensory Voice'' <ref>[http://www.schach-computer.info/wiki/index.php/Fidelity_Chess_Challenger_Voice Fidelity Chess Challenger Voice] from [http://www.schach-computer.info/wiki/index.php/Hauptseite_En Schachcomputer.info Wiki] (German)</ref>, a [[Z80]] based Nelson Program as Micro Champ? <ref>[http://www.schach-computer.info/wiki/index.php/Fidelity_CC_Sensory_Voice Fidelity CC Sencory Voice] was a [[Z80]] based Nelson program, and not the [[6502]] based Spracklen program which won the [[WMCCC 1980]]</ref>

==WCCC 1980==

The ''Chess Challenger'' which played the [[WCCC 1980]] end of September in Linz and finished last was presumably an older Z80 based computer with a Nelson program <ref>[https://www.computerwoche.de/a/mikros-noch-ohne-grossmeister-format,1191318 Sargon immer noch Marktführer:: Mikros noch ohne Großmeister-Format], [[Computerworld#Woche|Computerwoche]], November 28, 1980 (German)</ref>. Fidelity's flagship end of the 70s, with World Champion 1980 advertisement was the ''Chess Challenger Sensory Voice''. The first 6502 based computer with a Spracklen program commercially available appeared in 1981 as ''Champion Sensory Chess Challenger'' <ref>[http://www.schach-computer.info/wiki/index.php/Fidelity_CC_Champion Fidelity CC Champion] from [http://www.schach-computer.info/wiki/index.php/Hauptseite_En Schachcomputer.info Wiki] (German)</ref> .