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Subject: Re: Two interesting snapshots from a little fun-match Crafty-Tiger

Author: Uri Blass

Date: 11:16:43 08/13/00

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On August 13, 2000 at 11:13:04, Alvaro Rodriguez wrote:

>On August 13, 2000 at 10:59:22, pete wrote:
>
>>For my personal pleasure I have played a little match Crafty-Tiger, both without
>>opening book and tablebases , Time control 40 in 40 ; Tiger on a PIII500 ,
>>Crafty on 4 Ultra-Sparc 450 CPUs .
>>
>>Two interesting positions :
>>
>>a.)
>>
>>[D]3r1rk1/2p1Rppp/p4n2/1p1b4/3P4/3B3P/PPPN2P1/4R1K1 b - - 0 1
>>
>>Here Tiger played what seems to be the decisive mistake 21. ... Bxa2 ??
>
>>
>>This is an interesting move IMHO as the bishop doesn't get lost at all , it
>>simply can't participate in the game anymore ; in fact it lasts until the 46th
>>move when white finally wins the bishop . It seems to me without special code it
>>is impossible to avoid this ( for example Fritz 6a would play like that too) .
>>
>>Is it possible to survive after Bxa2 ? Which programs will avoid Bxa2 ?
>
>When you say that the bishop doesn´t ge lost, in fact it does, because the
>bishop don´t have a good square to move!! It´s not participating in the game at
>all, and white is a piece down.. It´s interesting to see what other programs
>play... I think this move is slightly more interesting then the other game,
>because this is certainly a losing move IMO..

I will not play this move in a game but I am not sure that Bxa2 is losing.
It is possible that black can free the bishop by sacrificing the pawn by the
idea a5,a4 and get material equality and free bishop.

White need something to protect b3 so the white pieces are also not 100% active.

Uri



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