Author: Ulrich Tuerke
Date: 07:33:11 07/30/03
Go up one level in this thread
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 > >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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