Author: Dieter Buerssner
Date: 12:29:19 01/18/04
Go up one level in this thread
On January 17, 2004 at 17:02:19, Uri Blass wrote:
>On January 17, 2004 at 16:55:35, Dieter Buerssner wrote:
>
>>I think, such high depth without real convincing score is a sign for draw.
>I am not sure
>When the score goes up it is a sign for a win.
Yes, you are right. I made some experiments. Mainly let Yace play vs. Yace. Yace
always won with white. Then I tried Yace-Shredder 6. I used Yace in console
mode, analyze - and Shredder with tournament time control. I gave Shredder only
64 MB HTs, but for Yace I moved much faster. Yace won. So, - to answer your
original question: White can win! Whether it is a forced win or not, is a more
difficult question.
A sample game:
[Event "?"]
[Site "?"]
[Date "2004.01.18"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "8/8/5pk1/5b2/7K/3R3p/7P/8 w - -"]
1. Rd1 {0s} Be6 {-1.39/21 3:07m} 2. Rg1+ {5s (Re1)} Kh6
{-1.40/21 3:13m} 3. Re1 {37s (Rc1)} Bf5 {-1.47/24 5:25m}
4. Rf1 {9s (Re3)} Kg6 {-1.46/20 13s} 5. Rg1+ {1:09m (Rc1)}
Kf7 {-1.47/19 7s} 6. Kh5 {1:59m (Re1)} Ke6 {-1.37/15 7s}
7. Rg3 {49s} Kf7 {-1.58/18 3:22m} 8. Ra3 {2s} Bd7 {-1.77/18
4:36m} 9. Ra7 {42s (Ra8)} Ke6 {-1.73/15 10s} 10. Kh6 {23s}
Bc8 {-1.87/21 6:57m} 11. Kg6 {13s} Ke5 {-1.92/21 6:58m}
12. Ra5+ {2:37m} Kf4 {-1.92/21 4:39m} 13. Kxf6 {6:25m
(Ra6)} Bd7 {-2.17/21 4:09m} 14. Rh5 {41s (Rd5)} Kg4
{-2.16/20 2:50m} 15. Rd5 {6s} Bc6 {-2.21/19 2:40m} 16. Rc5
{1:27m (Rd6)} Bg2 {-2.34/20 3:46m} 17. Ke5 {1:11m (Rf5)}
Kf3 {-2.44/25 3:45m} 18. Rc3+ {9s} Kg4 {-2.40/18 0s}
19. Rg3+ {1:26m} Kh4 {-2.51/21 0s} 20. Kf5 {56s (Kf4)} Bf1
{-2.54/21 3:38m} 21. Rg4+ {1:11m} Kh5 {-2.54/22 0s} 22. Rg8
{1:09m} Bd3+ {-2.54/22 6:13m} 23. Kf4 {40s} Bf1 {-2.66/23
3:51m} 24. Rf8 {30s (Rg7)} Kg6 {-2.86/23 4:02m} 25. Kg4
{22s} Bg2 {-3.63/24 9:10m} 26. Rf2 {19s} Kg7 {-M43/22
2:36m} 27. Kg5 {6s} Bd5 {-2.85/18 2:51m} 28. Rf6 {24s
(Rf5)} Ba8 {-M41/18 6:12m} 29. Rh6 {20s} Bg2 {-M40/21 12s}
30. Re6 {27s} Kf7 {-M39/23 1:46m} 31. Re3 {5s} Kg8 {-M38/24
3:03m} 32. Re7 {4s} Bh1 {-M37/22 2:16m} 33. Kf6 {5s} Bc6
{-M36/23 1:09m} 34. Re5 {15s} Bh1 {-M35/25 2:15m} 35. Rg5+
{10s} Kh7 {-M34/25 0s} 36. Rh5+ {32s} Kg8 {-M33/26 0s}
37. Rxh3 {19s} Be4 {-M32/4 0s} *
And, a sample PV (following above game):
82359542 2:08.1 Mat49 24t 23.Kf4 Bf1 24.Rf8 Bg2 25.Kf5 Kh6 26.Kg4 Kg7
27.Rf2 Kg6 28.Rf4 Kg7 29.Kg5 Bc6 30.Rf6 Bd5
31.Rh6 Bg2 32.Re6 Kf7 33.Re3 Kg8 34.Re7H Bh1H
35.Kf6H Bd5H 36.Rg7+H Kh8H 37.Rg4H Bc6H
38.Rh4+H Kg8H 39.Rxh3H {EGTB} 39...Be4! 40.Rc3
Bb1 41.Rc7 Bd3 42.h4 Be4 43.Kg5! Bh7 44.Kh6!
Be4! 45.Rg7+ Kf8! 46.Rg5! Kf7! 47.Rg3! Bc2
48.Kh5! Kf6! 49.Rg5 Bf5! 50.Kh6! Bd3 51.Rg7 Bc4
52.Rd7 Bb5 53.Rd2! Ba4 54.Rf2+ Ke6 55.h5 Bd1!
56.Rd2 Bf3 57.Kg5! Bxh5! 58.Kxh5!! Ke5! 59.Rd1
Ke6 60.Kg4! Ke5! 61.Kf3! Kf5 62.Re1! Kg5!
63.Re5+ Kg6 64.Kg4! Kf6! 65.Re4 Kg6 66.Rf4! Kh6
67.Kf5! Kg7! 68.Kg5! Kh7 69.Kf6! Kh8 70.Kf7!
Kh7 71.Rh4#! {500}
Shredder was at -2.x at that time.
>Here is depth 32(not finished)
>Yace failed high again.
I let run Yace overnight in the root position. I got:
740162842 38:24.8 0.85 30. 1.Rd1 Be6 2.Rg1+ Kh6 3.Rf1 Kg6 4.Rd1
856152791 48:23.9 0.85 31t 1.Rd1 Be6 2.Rg1+ Kh6 3.Rf1 Kg6 4.Rd1 Bc8 5.Rg1+
Kh6 6.Kg3H Bd7H {HT}
864264406 49:17.5 0.86 31t+ 1.Rg3+ Kh6
940486833 53:53.4 1.25 31++ 1.Rg3+ Kh6 2.Rf3 Kg6 3.Rf1 Bd7 4.Rg1+ Kh6 5.Rd1
Bc8 6.Rf1 Kg6 7.Rg1+ Kh6 8.Kg3 Kg6 9.Kf4+ Kf7
10.Rc1 Be6 11.Rc6 f5
1058786375 1:07:34 1.25 31t 1.Rg3+ Kh6 2.Rf3 Bd7H {HT}
1119251878 1:13:44 1.26 31t+ 1.Rd5 Be6 2.Ra5 Kf7
1273058881 1:30:11 1.26 31t 1.Rd5 Be6 2.Ra5 {HT}
1330009222 1:37:44 1.27 31t+ 1.Re3 Kh6 2.Re1 Kg6 3.Rg1+ Kh6 4.Kg3 Be6 5.Kf3
Bf5
1500342150 1:56:14 1.26 31t- 1.Re3 Bd7 2.Re4
1500342150 1:56:14 1.26 31t 1.Rd5 Be6 2.Ra5
1517346038 1:57:55 1.26 31. 1.Rd5 Be6 2.Ra5
2684428739 3:57:25 1.66 32++ 1.Rd5 Be6 2.Rd2 Bf5 3.Rd8 Kf7 4.Kh5 Ke6
2965094446 4:33:59 1.66 32t 1.Rd5 Be6 2.Rd2 Kf7H {HT}
3031058712 4:41:38 1.67 32t+ 1.Rg3+ Kh6 2.Rf3 Bd7 3.Rxf6+ Kg7 4.Kg5 Be8
3306833373 5:12:13 1.67 32t 1.Rg3+ Kh6 2.Rf3 Kg6H 3.Kg3H {HT}
3384211848 5:23:17 1.68 32t+ 1.Rd1 Be6 2.Rg1+ Kh6 3.Re1 Bd7 4.Rd1 Bc8 5.Rf1
Kg6 6.Rg1+ Kh6 7.Kg3 Kg6H 8.Kf4+H Kf7H 9.Rc1H
Be6H 10.Rc6H Bd7H 11.Rc7H Ke6H {HT}
3632413152 5:58:11 1.68 32t 1.Rd1 Be6 2.Rg1+ Kh6H 3.Re1H Bd7H 4.Rf1H Kg6H
5.Rf5H {HT}
3675728063 6:05:36 1.68 32. 1.Rd1 Be6 2.Rg1+ Kh6 3.Re1 Bd7 4.Rf1 Kg6 5.Rf5
1249277831 10:43:00 1.78 33t 1.Rd1 Be6 2.Rg1+ Kh6 3.Rf1 Kg6 4.Rd1 Bc8H
5.Rg1+H Kh6H 6.Kg3H Kg5H 7.Kf3+H Kf5H 8.Rg4H
Be6H 9.Rg7H Ke5H 10.Re7H Kf5H 11.Kg3H Ke5H
12.Re8H Kd6H 13.Kf4H Bf7H 14.Rb8H f5H {HT}
times are not really accurate, because I paused the analysis for one hour.
Also, I did not set up the analysis very well. I used too much HT (using less HT
size would have given more cache to the OS and better prformance).
The 1.5 scores of Yace: For me the only explaination indeed is, that it sees way
down in the search, that a pawn will be captured.
Regards,
Dieter
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