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This is the move which turned a win into a loss, and allowed Cray to clinch its undisputed first. White wins a second Pawn, but in the coming Pawn ending its material edge is worthless as the white King is too far removed to cope with Black's lone, but distant passed a-Pawn. [[William Blanchard]] of the Nuchess team dejectedly confirmed that this program failed to include the principle of the King having to be inside the square of the Pawn to catch it. Of course, Nuchess's search did not extend so deeply that it could see the a-Pawn queening. [[Robert Hyatt|Hyatt]] said that Cray knew about the square of the Pawn rule, but that this was the first time he was aware the principle was relevant to the computer's move choice...
[[ACM 1984]], round 4, [[Nuchess]] - [[Cray Blitz]] <ref>[http://www.csvn.nl/downloads/partijen/landen-kampioenschappen/north-america/95-verzamelde-partijen-van-north-american-computer-chess-championships-1984-1994/file NACCC download], [[CSVN]] site</ref>
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[Event "ACM 1984"]
