Author: Uri Blass
Date: 16:27:28 08/04/05
Go up one level in this thread
On August 04, 2005 at 19:23:28, Uri Blass wrote: >On August 04, 2005 at 18:24:58, George Tsavdaris wrote: > >>One of Shredder weak points is some wrong-color-Bishop endgames. > >It is not a weakness of shredder but weakness of most chess programs in case >that it is a draw and white cannot force black to play b5 later and win by axb5 > >It is not obvious for me that it is impossible without analysis so it is not >obvious for me that it is a draw. > > >I tried the second best program in the world(Fruit2.1) > >New game, >8/8/8/pp6/1P2k3/P1K5/5Bp1/8 w - - 0 1 > >Analysis by Fruit 2.1: > >1.bxa5 > +- (1.87) Depth: 1/1 00:00:00 >1.bxa5 Kd5 > +- (1.86) Depth: 2/7 00:00:00 >1.bxa5 Kd5 2.a6 > +- (2.48) Depth: 3/7 00:00:00 >1.bxa5 Kd5 2.a6 Kc6 > +- (2.63) Depth: 4/7 00:00:00 >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 > +- (2.93) Depth: 5/7 00:00:00 >1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kxb5 > +- (3.34) Depth: 6/11 00:00:00 5kN >1.bxa5 Kd5 2.a6 Kc6 3.a7 Kb7 4.Kd3 Ka8 > +- (3.42) Depth: 7/11 00:00:00 12kN >1.bxa5 Kd5 2.a6 Kc6 3.a7 Kb7 4.Kd3 Ka8 5.Bd4 > +- (3.71) Depth: 8/13 00:00:00 26kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.a7 Kb7 5.Bd4 Ka8 > +- (3.71) Depth: 9/13 00:00:00 50kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.Ke4 Kc6 5.Kf3 b4 6.axb4 > +- (4.48) Depth: 10/15 00:00:01 91kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.a7 Kb7 5.Ke4 Ka8 6.Kf3 Kb7 7.Kxg2 > +- (5.08) Depth: 11/17 00:00:01 163kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.a7 Kb7 5.Ke4 Ka8 6.Kf3 Kb7 7.Kxg2 > +- (5.08) Depth: 12/18 00:00:01 267kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.Ke4 Kc6 5.a7 Kb7 6.Kf3 Ka8 7.Bd4 Kb7 8.Kxg2 > +- (5.37) Depth: 13/22 00:00:01 456kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.a7 Kb7 5.Ke4 Ka8 6.Kf3 Kb7 7.Kxg2 Ka8 8.Bd4 > +- (5.64) Depth: 14/24 00:00:01 769kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.Ke4 Kc6 5.Kf3 Kc7 6.Kxg2 Kc6 7.a7 Kb7 8.Bd4 Ka8 > +- (5.64) Depth: 15/28 00:00:01 1259kN >1.bxa5 Kd5 2.a6 Kc6 3.a7 Kb7 4.Kd3 Ka8 5.Ke4 Kb7 6.Kf3 Ka8 7.Kxg2 Kb7 8.Bd4 Ka8 >9.Kf3 > +- (5.90) Depth: 16/36 00:00:02 2281kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.Ke4 Kb8 5.Kf3 Kc7 6.Kxg2 Kb8 7.Bd4 Kc7 8.a7 Kb7 >9.Kf3 Ka8 > +- (5.90) Depth: 17/46 00:00:02 3919kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.Ke4 Kb8 5.Kf3 Kc7 6.Kxg2 Kb8 7.Bd4 Kc7 8.a7 Kb7 >9.Kf3 Ka8 10.Ke4 > +- (6.17) Depth: 18/46 00:00:03 5739kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.Ke4 Kb8 5.Kf3 Kc7 6.Kxg2 Kb8 7.Bd4 Kc7 8.Kf3 Kc6 >9.a7 Kb7 10.Ke4 Ka8 > +- (6.17) Depth: 19/46 00:00:06 9603kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.Ke4 Kb8 5.Kf3 Kc7 6.Kxg2 Kb8 7.Bd4 Kc7 8.Kf2 Kb8 >9.a7+ Kb7 10.Ke3 Ka8 11.Ke4 > +- (6.17) Depth: 20/46 00:00:10 16663kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.Ke4 Kb8 5.Kf3 Kc7 6.Kxg2 Kb8 7.Bd4 Kc7 8.a7 Kb7 >9.Kf3 Ka8 10.Ke4 Kb7 11.Kd5 Ka8 > +- (6.21) Depth: 21/48 00:00:16 25943kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.Ke4 Kb8 5.Kf3 Kc7 6.Kxg2 Kb8 7.Bd4 Kc7 8.a7 Kb7 >9.Kf3 Ka8 10.Ke4 Kb7 11.Ke5 Ka8 12.Kd5 > +- (6.21) Depth: 22/57 00:00:29 45845kN >1.bxa5 Kd5 2.a6 Kc6 3.Kd3 Kc7 4.Ke4 Kb8 5.Kf3 Kc7 6.Kxg2 Kb8 7.Bd4 Kc7 8.Kf3 Kb8 >9.Ke4 Kc7 10.Kd5 Kb8 11.Kc6 Ka8 12.Kd5 > +- (6.31) Depth: 23/59 00:00:55 84289kN > >(, 05.08.2005) > > > >>The above is just an example but of course there are thousants similar (E.Nemeth >>posted many at the past) and this can probably cost at tournaments and I WONDER >>WHY SMK DOESN'T FIX THIS?!?!?!? > >I remember a game when knowledge of Junior that this type of position is a draw >costed it a point against shredder because shredder forced Junior to play b5 and >won by axb5. > >Uri Yace also has problems and it is unable to see that the main line is leading to stalemate. It may be a draw because of stalemate but there are cases when the stalemate trick does not work. New game, 8/8/8/pp6/1P2k3/P1K5/5Bp1/8 w - - 0 1 Analysis by Yace 0.99.87: 1.bxa5 +- (2.44) Depth: 1 00:00:00 1.bxa5 +- (2.44) Depth: 1 00:00:00 1.bxa5 Kd5 +- (2.44) Depth: 2 00:00:00 1.bxa5 Kd5 +- (2.44) Depth: 2 00:00:00 1.bxa5 Kd5 2.a6 +- (2.78) Depth: 3 00:00:00 1.bxa5 Kd5 2.a6 +- (2.78) Depth: 3 00:00:00 1.bxa5 Kd5 2.a6 Kc6 +- (2.88) Depth: 4 00:00:00 1.bxa5 Kd5 2.a6 Kc6 +- (2.88) Depth: 4 00:00:00 1.bxa5 Kd5 2.a6 Kc6 3.Bg1 +- (3.06) Depth: 5 00:00:00 1.bxa5 Kd5 2.a6 Kc6 3.Bg1 +- (3.06) Depth: 5 00:00:00 1.bxa5 Kd5 2.a6 b4+ 3.axb4 g1B +- (3.46) Depth: 6/9 00:00:00 4kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kxb5 +- (3.90) Depth: 6/10 00:00:00 5kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kxb5 +- (3.90) Depth: 6/10 00:00:00 12kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kxb5 +- (3.90) Depth: 7/10 00:00:00 17kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kxb5 +- (3.90) Depth: 7/13 00:00:00 30kN 1.bxa5 Kd5 2.Bd4 Kc6 3.a4 g1Q 4.Bxg1 bxa4 +- (3.50) Depth: 8/13 00:00:00 36kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.a4 bxa4 +- (3.14) Depth: 8/13 00:00:00 42kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.a4 bxa4 +- (3.14) Depth: 8/15 00:00:00 78kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.a4 bxa4 5.Kxa4 +- (3.14) Depth: 9/15 00:00:00 97kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.a4 bxa4 5.Kxa4 +- (3.14) Depth: 9/17 00:00:00 156kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.a4 bxa4 5.Ba7 Kd6 6.Kxa4 +- (2.95) Depth: 10/17 00:00:00 198kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.a4 bxa4 5.Ba7 Kd6 6.Kxa4 +- (2.95) Depth: 10/23 00:00:00 336kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.a4 bxa4 5.Ba7 Kd6 6.Kxa4 +- (2.95) Depth: 11/23 00:00:00 419kN 1.Bg1 a4 2.Kd2 Kf3 3.Kd3 Kg3 4.Kd4 Kf3 5.Kc5 Kf4 +- (2.96) Depth: 11/23 00:00:00 530kN 1.Bg1 a4 2.Kd2 Kf3 3.Kd3 Kf4 4.Ke2 Kf5 +- (3.11) Depth: 11/23 00:00:00 577kN 1.Bg1 a4 2.Kd2 Kf3 3.Kd3 Kf4 4.Ke2 Kf5 +- (3.11) Depth: 11/26 00:00:01 697kN 1.Bg1 a4 2.Kd2 Kd5 3.Bc5 Kc4 4.Kc2 Kd5 5.Kd3 Ke5 6.Ke2 Kf5 +- (3.21) Depth: 12/26 00:00:01 841kN 1.Kd2 Ke5 +- (3.22) Depth: 12/26 00:00:02 1099kN 1.Kd2 Ke5 2.Kd3 Kd5 3.Be3 Kd6 4.Ke4 Ke6 5.Kf3 a4 6.Kxg2 +- (3.24) Depth: 12/26 00:00:02 1378kN 1.Kd2 Ke5 2.Kd3 Kd5 3.Be3 Kd6 4.Ke4 Ke6 5.Kf3 a4 6.Kxg2 +- (3.24) Depth: 12/26 00:00:02 1462kN 1.Kd2 Ke5 2.Kd3 Kd5 3.Be3 a4 4.Bd4 Kd6 5.Bc5+ Kd5 6.Kd2 Kc4 7.Kc2 Kd5 8.Kd3 Ke5 9.Ke2 Kd5 10.Kd2 Kc4 11.Kc2 Kd5 12.Kd3 Ke5 13.Ke2 Kd5 14.Kd2 +- (3.21) Depth: 13/27 00:00:03 1778kN 1.bxa5 Kd5 2.a6 Kc6 3.a7 b4+ 4.axb4 Kb7 +- (3.22) Depth: 13/27 00:00:04 2001kN 1.bxa5 Kd5 2.a6 Kc6 3.a7 b4+ 4.axb4 Kb7 +- (3.64) Depth: 13/27 00:00:04 2029kN 1.bxa5 Kd5 2.a6 Kc6 3.a7 b4+ 4.axb4 Kb7 +- (4.64) Depth: 13/27 00:00:04 2063kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kc5 Kb8 5.Kc6 g1Q 6.Bxg1 Ka8 7.a7 b4 +- (7.00) Depth: 13/27 00:00:05 2395kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kc5 Kb8 5.Kc6 g1Q 6.Bxg1 Ka8 7.a7 b4 +- (7.00) Depth: 13/27 00:00:05 2689kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kc5 Kb8 5.Kc6 g1Q 6.Bxg1 Ka8 7.Kc7 b4 +- (7.03) Depth: 14/27 00:00:08 3331kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kc5 Kb8 5.Kc6 g1Q 6.Bxg1 Ka8 7.Kc7 b4 +- (7.03) Depth: 14/27 00:00:10 4346kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kc5 Kb8 5.Kc6 g1Q 6.Bxg1 Ka8 7.Kc7 b4 8.axb4 +- (7.03) Depth: 15/27 00:00:15 5547kN 1.bxa5 Kd5 2.a6 Kc6 3.Kb4 Kc7 4.Kc5 Kb8 5.Kc6 g1Q 6.Bxg1 Ka8 7.Kc7 b4 8.axb4 +- (7.03) Depth: 15/32 00:00:19 6953kN (, 05.08.2005)
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