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=Forum Posts=
==1997 ...==
* [https://groups.google.com/g/rec.games.chess.computer/c/O4-oPbjN1tw/m/WKjgXrMs7cwJ Several Questions] by [[William Bryant]], [[Computer Chess Forums|rgcc]], December 12, 1997
==2000 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?t=12970 Playing Ron Nelson Programs, Today] by [[Fernando Villegas]], [[CCC]], April 08, 2007
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=29593 Grandmaster Excalibur Revenge his Brothers...] by [[Fernando Villegas]], [[CCC]], August 29, 2009
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=29678 Breaking News:The Real Strenght of Grandmaster by Excalibur] by [[Fernando Villegas]], [[CCC]], September 06, 2009
==2010 ...==
* [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
==Chess Computer==
* [https://www.schach-computer.info/wiki/index.php/Excalibur_Grandmaster Excalibur Grandmaster] - [https://www.schach-computer.info/wiki/index.php?title=Hauptseite_En Schachcomputer.info Wiki] (German)
* [https://www.chess.com/forum/view/chess-equipment/excalibur-grandmaster-platinum-chess-computer-1997 Excalibur Grandmaster "Platinum" Chess Computer (1997) - Chess Forums] - [https://en.wikipedia.org/wiki/Chess.com [Chess.com]]
* [http://www.spacious-mind.com/html/excalibur.html Excalibur Electronic Chess Computer Collection], [[The Spacious Mind]]
* Grandmaster Excalibur Chess Computer Review, [https://en.wikipedia.org/wiki/YouTube YouTube] Video
