No matter what Ron nelsons function was at fidelity or Excalibur.
He had written a chess program for z80a before spracklen came to fidelity,
IMO this program plays kind of similar chess like the later h8 machines, only that the h8 programs came deeper.

This program was maybe continued and transferred on different hardware.
Why should he not continue or transfer it on other machines ?
Or tell another programmer to transfer it ?
That is what ALL programmers do or have done.

Kittinger, morsch, ... Lang... They all let their programs transfer on new different hardware.

First z80a, 6502, 6301, 6800, h8...

Until today programmers use their engines as apps under iOS, android or windows.

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