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* [http://hiarcs.net/forums/viewtopic.php?t=6768 Ron Nelson Ever Copied, Used , Cloned the Spracklen?] by [[Fernando Villegas]], [[Computer Chess Forums|Hiarcs Forum]], July 05, 2014
: [http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=68 Re: Ron Nelson Ever Copied, Used , Cloned the Spracklen?] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], December 21, 2015
: [http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=78 Excalibur Electronics] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], December 22, 2015» [[ACM 1981]], [[Belle|Belle's]] [[Attack and Defend Maps|Attack Maps]]
: [http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=82 Excalibur Electronics] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], December 22, 2015
: [http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=84 Consumer Computer Chess History Trivia] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], December 22, 2015 » [[David Kittinger]], [[WMCCC 1981]], [[Mark Taylor]]
