Author: Uri Blass
Date: 12:06:21 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? > >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 Analysis by Comet B60: -+ (-3.80) 1.Bf2 00:00:00 -+ (-3.73) 1.Be3 00:00:00 -+ (-2.75) 1.Bh2 00:00:00 -+ (-2.49) 1.Kc3 00:00:00 -+ (-3.19) 1.Kc3 h2 2.Bxh2 g1Q 00:00:00 -+ (-2.68) 1.Bh2 Kc6 00:00:00 -+ (-2.25) 1.Bh2 Kc6 2.Kc4 00:00:00 -+ (-2.16) 1.Kc3 Kc6 2.Kc4 00:00:00 -+ (-2.58) 1.Kc3 Kc6 2.Bh2 Kb5 00:00:00 -+ (-2.16) 1.Bh2 Kb6 2.Bg1+ Kc6 3.Kc4 00:00:00 -+ (-1.93) 1.Bh2 Kb6 2.Kc4 Kc6 3.b5+ Kb6 00:00:00 -+ (-1.46) 1.Kc3 Kc6 2.Kd3 Kd5 3.b5 00:00:00 -+ (-1.65) 1.Kc3 Kc6 2.Kc4 Kd6 3.b5 Ke5 00:00:00 µ (-1.18) 1.Kc3 Kc6 2.Kc4 Kc7 3.b5 Kb7 4.Kc5 00:00:00 -+ (-1.48) 1.Kc3 Kc6 2.Kc4 Kb7 3.b5 Ka8 4.Bh2 Kb7 00:00:01 µ (-1.20) 1.Bh2 Kb6 2.Kc4 Kb7 3.b5 Ka8 4.Kc5 Kb7 00:00:01 µ (-1.18) 1.Bh2 Kb6 2.Kc4 Kb7 3.b5 Ka7 4.Kc5 00:00:02 µ (-0.84) 1.Kc3 Kc6 2.Kc4 Kd7 3.b5 Kc8 4.Kd5 h2 00:00:02 µ (-0.95) 1.Kc3 Kc6 2.Kd3 Kd5 3.b5 Kd6 4.Kc4 Kc7 5.Bh2+ 00:00:04 = (-0.08) 1.Kc3 Kc6 2.Kd4 Kb7 3.Ke4 h2 00:00:06 = (-0.08) 1.Kc3 Kc6 2.Bh2 Kb6 3.Be5 g1Q 4.Kb3 00:00:06 = (0.00) 1.Kc3 Kc6 2.Kd4 Kc7 3.Ke3 Kc6 4.Kf3 h2 5.Bxh2 Kb5 6.Kxg2 00:00:10 = (0.00) 1.Kc3 Kc6 2.Kd4 Kb6 3.Ke4+ Kb5 4.Kf4 h2 5.Bxh2 g1Q 6.Bxg1 00:00:17 ± (0.85) 1.Bh2 Kc6 2.Kc4 Kd7 3.b5 Ke7 4.b6 Kf7 5.b7 Kg6 6.b8Q g1Q 00:00:17 +- (2.56) 1.Bh2 Kc6 2.Kc4 Kd7 3.b5 Ke7 4.b6 Kf7 5.b7 Kg6 6.b8Q g1R 00:00:17 +- (3.95) 1.Bh2 Kc6 2.Kc4 Kb7 3.Kc5 Ka7 4.b5 Ka8 5.Kc6 Ka7 6.b6+ Ka6 7.b7 Ka7 8.b8Q+ Ka6 9.Qb6# 00:00:18 +- (3.91) 1.Bh2 Kc6 2.Kc4 Kb6 3.b5 Ka7 4.Kc5 Kb7 00:00:24 (Blass, Tel-Aviv 29.07.2003) Uri
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