Author: Gabor Szots
Date: 05:44:41 01/19/04
Go up one level in this thread
On January 19, 2004 at 02:24:03, Kurt Utzinger wrote: >On January 18, 2004 at 17:58:26, Dieter Buerssner wrote: > >>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 > > Hi Dieter > Many thanks for your interesting explanation that will help > us to better understand what's your engine is doing. > Kurt I agree. This is the first time I am expleined what these signs after depth mean, although I am not still uncertain about the negative sign (does it mean upperbound, i.e. this is a move by which the score will not improve above what is displayed?). Gábor
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