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Subject: Re: From a CHESS4.0 game

Author: José Antônio Fabiano Mendes

Date: 09:20:21 02/04/00

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On February 03, 2000 at 17:17:15, Robert Hyatt wrote:

>On February 02, 2000 at 07:36:12, José Antônio Fabiano Mendes wrote:
>
>>CHESS4.0-Dartmouth program *** Fourth ACM computer chess tournament
>>Source:"Chess Skill in Man and Machine", Springer-Verlag,page 163
>>[D]r6k/1p3ppp/1p6/1R1Qp3/r3P2q/2P2P2/P2R2PP/K7 w - -
>>Larry R. Harris writes:"a 9-ply search is required to determine that
>>Black´s attack is harmless and therefore White can safely proceed with RxP."
>>It seems though that Black´s attack is strong enough for a draw.
>>[for instance:1.Rxb6 Qe1+ 2.Rb1 Rxa2+ 3.Rxa2 Qxc3+ and draws]
>>Any comments?   Enjoy,JAFM
>
>
>Actually I am not sure Rxb6 is the best move.  As a human I would avoid the
>nonsense with Rb1, as white still wins a pawn in the deal since the queen is
>attacking b7.
>
>Of course, at that tournament, chess 4.0 was running on an older CDC machine
>and was searching (maybe) 1K nodes per second, so it is doubtful they were
>able to get beyond 5 plies, maybe 6 at the max, since they were searching 6
>plies in 1976 on the Cyber 176.  I was at that tournament watching, but don't
>remember what they played...

You are right,Rb1 seems to be the move here. JAFM



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