Psi Chess

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Psi Chess screen with 3D board [1]

Psi Chess, (PsiCHESS)
a commercial chess program for the ZX Spectrum 48K by Steven L. Watson and Jack Wilkes, released in 1986 by The Edge [2]. Psi Chess features 2D or 3D boards with Staunton or Lewis chess sets, various playing modes, and is aware of all chess rules including minor promotions, threefold repetition, the fifty-move rule and draw by insufficient material [3].


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