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Subject: Re: Topalov-Svidler Corus 2004 Rd 7 (Yace PB)

Author: Dieter Buerssner

Date: 14:58:26 01/18/04

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On January 18, 2004 at 15:59:46, Ricardo Gibert wrote:

>On January 18, 2004 at 15:40:47, Kurt Utzinger wrote:
>>14+  01:54 -2.63   Ke8 Qc4 Kd7 Rd1+ Ke8 Rd5
>
>The -2.63 score of the last PV starting with Ke8 got me curious. How come so
>negative? But then I noticed that the last move Rd5 is nonsense. What happened
>to Yace here?

Note the "14+". This means, that the engine reported a score as "lowerbound". It
was outside the search window. Many (most) engines will not show a PV in this
case at all. Yace tries to show something - often it is stupid (by design). I
thought, it is better than nothing. To have the typical output of other engines,
just ignore any PV after depth+/depth-. I did not look at this specific PV. It
should mean, however "I guarantee you, that with depth 14, I will get a score
not worse than -2.63. How much better the score will turn out, I don't know yet.
The PV fragment I show here, should be enough to convince you, that my score
really is better than -2.63. This does not mean, that for examply Rd5 is the
best move. But it should mean, I tried all moves (instead of Rd5), and no one
helped to bring the score back to -2.64 for the opponent.

Regards,
Dieter



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