Author: Uri Blass
Date: 08:39:16 07/30/03
Go up one level in this thread
On July 30, 2003 at 10:33:11, Ulrich Tuerke wrote: >On July 29, 2003 at 15:06:21, Uri Blass wrote: > >>On July 29, 2003 at 14:19:37, Gerd Isenberg wrote: >> >>>On July 29, 2003 at 12:11:21, Ulrich Tuerke wrote: >>> >>>>On July 29, 2003 at 11:59:06, Ulrich Tuerke wrote: >>>> >>>>>On July 29, 2003 at 11:56:12, Steffen Jakob wrote: >>>>> >>>>>>Hi Uli! >>>>>> >>>>>>On July 29, 2003 at 11:50:14, Ulrich Tuerke wrote: >>>>>> >>>>>>>>[D]8/p7/2K5/1P6/1k6/8/7p/7B w - - 0 67 >>>>>>>> >>>>>>>>Is there an engine which sees that this is a draw? Here is the complete score: >>>>>> >>>>>>>Comet sees it (without TB); I guess, many engines will: >>>>>> >>>>>>At least Hossa and Fritz 8 don't. >>>>>> >>>>>>>Comet-B.60 Tue Jul 29 17:43:34 2003 >>>>>>> >>>>>>>depth score sec nodes pv >>>>>>> 1. -0.98 0 37 h1e4 >>>>>>> 2. -0.98 0 118 h1d5 b4c3 >>>>>>> 3. -0.84 0 594 h1d5 b4c3 c6d6 >>>>>>> 4. -0.40 0 991 h1d5 b4c3 d5h1 c3d4 >>>>>>> 4. -0.40 0 1750 h1d5 b4c3 d5h1 c3d4 >>>>>>> 5. -0.67 0 4167 h1d5 b4a5 c6c5 a5a4 d5b7 >>>>>>> 5. -0.67 0 7274 h1d5 b4a5 c6c5 a5a4 d5b7 >>>>>>> 6. -0.29 0 10668 h1d5 b4c3 c6d6 c3d4 d5c6 d4e3 >>>>>>> 6. -0.29 0 20066 h1d5 b4c3 c6d6 c3d4 d5c6 d4e3 >>>>>>> 7. -0.08 0 43767 h1d5 b4a4 d5e4 a4a5 c6c5 a7a6 b5b6 >>>>>> >>>>>>Do I interpret this correctly that Comet sees an advantage for black in the >>>>>>first 7 plies? Bishop and pawn vs. 2 bishops? >>>>> >>>>>Yes, that's right. >>>>>What have I done ? >>>>> >>>>>I guess, I'll have to have a look into the code to understand. -:) >>>> >>>> >>>> >>>>Looks like, it's black advanced passer leading to this score. The value of a >>>>lonely bishop decreases in Comet's eval with decreasing number of pawns on the >>>>board. >>>> >>>>OTOH, Comet knows that king + bishop alone can never win. So there is an upper >>>>limit of 0.0 for these kind of positions from white's point of view. White can't >>>>move its king without loosing it's pawn, which is a draw. >>> >>>Hi Uli, >>> >>>really great! Is all that knowledge in static eval for this special ending, >>>bishop+pawn against pawns? >>> >>>Regards, >>>Gerd >> >>The knowledge of Comet may be simply wrong and I am not sure if it is productive >> >>Here is an example >>Comet can see the win after search but if it is going to be the leaf position it >>may be happy with it with black. >> >>New game >>[D]8/8/8/1k6/1P6/1K5p/6p1/6B1 w - - 0 1 > >This position is a mean choice, Uri. Black's advanced connected passed pawns >make Comet think that black is far better: bad luck this time. -:) > >Uli I composed this position only to prove that it is not clear if the knowledge of Comet is productive. There are cases when it is better than Fritz but there may be cases when it is worse than other programs. Uri
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