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: [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
: [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=191 Ron Nelson & Talking Chess Computers] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], January 02, 2016
* [http://www.hiarcs.net/forums/viewtopic.php?t=7591 Excalibur Chess Products Ron Nelson designed/programmed] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], January 05, 2016
: [http://www.hiarcs.net/forums/viewtopic.php?t=7591&start=8 Chess Products Ron Nelson designed/programmed] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], January 11, 2016
