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Quote by [[Ron Nelson]] <ref>[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</ref>

In 1981 at the [[ACM 1981|California ACM Computer Chess Tournament]], [[Kathe Spracklen|Kathy]] introduced me to their friend [[Ken Thompson]]. I asked him about his [[Belle]] hardware chess machine, and he was quick to explain how the Hardware [[Attack and Defend Maps|Attack Bitmaps]] worked. I realized that attack bitmap approach was now in a [[Chess Challenger]], but in software. I used the Belle Attack Map generation on my [[H8]] program.

Further Quote by [[Ron Nelson]] <ref>[http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=170 Re: Ron Nelson] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], December 29, 2015</ref>

But it was my watching the [[Chess Game|games]] and the [[Principal Variation|PRVs]] like you do, and we did at [[ACM North American Computer Chess Championship|ACM tournaments]] that started me asking questions of [[Dan Spracklen|Dan]]. Why can we not [[Move Generation|generate]] [[Check|checks]] in the [[Quiescence Search|quiescent search]]? He said because it would blow up the search and slow down. Ok, I said, but what if we only generated checks that didn't occur as often, like a knight check that [[Double Attack|forked]] a major piece. He said, ummm,,, that would not take much and the search would not blow up. So that is how we slowly started developing a [[Tactics|tactical]] quiescent search that had all of the things a strong chess player explores when thinking of a tactical position. But I would see that the PRV was missing these obvious strong player "tricks" and have Dan look to see if he could add them. Because of the attack map, all this type of information was easily divined. At the [[WMCCC 1988|Micro Tournament]] in Spain, it was music to my ears to have the Chess Master commentator, perhaps [[Michael Valvo|Mike Valvo]], say The [[Fidelity]] unit was playing moves it had never before been capable of playing. Just like the Masters we played to get the certified rating, who were amazed.