Author: Ulrich Tuerke
Date: 12:52:36 07/29/03
Go up one level in this thread
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? Hi Gerd, I doubt that it's so much knowledge. I guess, it's just by chance that the poorly tuned eval could "solve" this. It just thinks that black is better; so white tries a repetition. -:) Seems that Uri has detected something where it doesn't work. c/u, Uli > >Regards, >Gerd > > >>Black can't move its >>king much either without loosing the game. It has to have a look on white's >>pawn. > > >> >>Thus, we see white bishop and black king moving back and forth, leading to >>repetitions. >> >>Uli >>> >>>Uli >>> >>> >>> >>>> >>>>Greetings, >>>>Steffen.
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