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Subject: Re: old deep blue's tactical mistake against kasparov

Author: blass uri

Date: 12:02:12 12/04/98

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On December 04, 1998 at 13:40:34, Ernst A. Heinz wrote:

>On December 04, 1998 at 06:14:38, blass uri wrote:
>
>>3r2k1/p4bp1/5q1p/8/3Npp2/1PQ5/P2R1PPP/6K1 w - - 0 1
>>
>>In this position old deep blue played 29.g3 and lost after Rd5
>>
>>Junior5 can find Ne2 in a few hours and I think that black cannot win after
>>29.Ne2
>>
>>When I give Junior5 the position after 29.g3 the evaluation after 10 hours is
>>more than a pawn advantage for black.
>>
>>I think that this position proves that deep blue as a program is sometimes worse
>>at tactics than top programs
>>If top programs were 500 times faster they could reject 29.g3 because of
>>tactical reasons at tournament time control.
>
>No 500x times speedup needed -- "DarkThought" happens to lock onto 29. Ne2
>in iteration #12 with a score of -0.25 after roughly 2 minutes on a 600MHz
>Alpha-21164a.
>
>But who knos if it does so for the right reasons ...
>
>=Ernst=

Fritz5 also finds Ne2 in a short time but not because of tactical reasons

You can compare the scores after Ne2 and after g3
If there is a big difference then it rejects g3 for a tactical reason otherwise
it rejects g3 for a positional reason.

Uri



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