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* [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
* [http://www.hiarcs.net/forums/viewtopic.php?t=9455 Ivan the Terrible, Ivan the Conqueror?] by [[Fernando Villegas]], [[Computer Chess Forums|Hiarcs Forum]], March 29, 2019
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