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In 1986, at the [[ACM 1986|17th ACM North American Computer Chess Championship]] in [https://en.wikipedia.org/wiki/Dallas Dallas], Fidelity showed up with two experimental machines. Fidelity Experimental with [[Danny Kopec]] as [[:Category:Opening Book AuthorsAuthor|Book author]] had one [[68020]] CPU, where three models also played the [[WMCCC 1986]] some streets farther with compatible time schedule. [[Chess Challenger|Chess Challenger X]] was a parallel system with a [[Z80]] controller, and 16 or more [[68000]] CPUs, co-authored by [[Ron Nelson]], with a Kopec book as well.