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Subject: Re: DB vs Kasparov Game 2 35. axb5

Author: Ernst Walet

Date: 07:25:48 11/17/98

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On November 16, 1998 at 16:40:57, Ernst Walet wrote:

>On November 16, 1998 at 14:50:57, Bruce Moreland wrote:
>
>>r1r1q1k1/6p1/p2b1p1p/1p1PpP2/PPp5/2P4P/R1B2QP1/R5K1 w - - 0 1
>>
>>It has been contended that this move would be difficult for a computer to find,
>>and this has caused some doubts to be raised as to whether the computer found it
>>without assistance in this game.
>>
>>I would like to ask how we can clear this up absent input from DB.
>>
>>Has anybody run this for a long period on a micro, and if so, was any move
>>selected other than 35. Qb6?
>>
>
>Aren't we talking about move 36 here?  I ran this position on a K6-266 with
>Tascbase 2.1 and after about 6 hours, completing ply 15, it still plays Qb6 with
>a score of +1.31.
>
>Shall try to find out how it evaluates axb5.
>
>>Is the counter-attacking line 35. Qb6 Qe7 36. axb5 Rab8 37. Qxa6 e4 supposedly
>>the reason that white shouldn't play 35. Qb6?  Or is it some other line?  If it
>>is too hard or impossible to find 35. axb5, would finding this line show
>>anything?
>>
>>Is there some minimum score delta we can achieve between the position after 35.
>>axb5 and 35. Qb6 that might be evidence that DB should be given the benefit of
>>the doubt?
>>
>>Are these questions unfair or wrong, if so, are their other questions that can
>>be asked and possibly answered that will help clear this up?
>>
>>bruce
>
>Ernst-Jan

After completing 14 ply's Tascbase evaluates Qb6 with +1.37 and axb5 with 0.75

Ernst-Jan



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