Author: Sune Larsson
Date: 01:07:02 06/23/01
Go up one level in this thread
On June 22, 2001 at 19:04:06, Dieter Buerssner wrote:
>On June 22, 2001 at 07:49:55, Sune Larsson wrote:
>
>> 8/p2B4/7p/k1p5/2P2p2/P1K1pP2/3nP2P/8 b - - 0 51
>[...]
>> Test: Can your program win this position with black?
>
>I let Yace play as black vs. Shredder 5 in analyze mode (so both engines were
>thinking at the same time on my 1-CPU computer). Whenenver I had a look, I did
>the suggested moves on the board (allways taking the suggestions of Yace for
>black and of Shredder for white). I was happy about the outcome :-)
Oh yes, you have all the reasons to be! This is no less than a masterpiece
shown! We had some short discussions about white playing h4 in a proper
moment, to prevent the black king from entering g5 and h4. Therbye making
the zugzwang theme in the original game, impossible. This is exactly what
Shredder did here. The following position after 9.Bd7 is crucial. A bit
too hasty I thought that 9.-Nf5 would lead to a rather unclear queen ending
and that black had to manuever some more with the knight.
[D]8/p2B4/7p/2p1k3/2P2p1P/P2KpPn1/4P3/8 b - - 0 9
But the secret is distant opposition and queening on e1!
After 10.Bxf5 Kxf5 black can force a position where he reaches
h5 when the white king is still on d3. Just like in your game.
Some notes to the very instructive game below:
13.-Kf6! (creates distant opposition - 14.Kd3 Kf5)
---
If 14.Kd3 Kf5! 15.h5 Ke5 16.Kc3 Kf6! 17.Kd3 Kf5 -+
---
If 17.Kd5 Kg3 18.Kxc5 Kf2 leads to a won queen ending for black.
---
If 18.Kxe3 Kg3 19.f4 Kg4 20.Ke4 h4 queens with check.
---
If 24.Kd5 Qe4+ 25.Kxc5 Qxc4+ -+
Sune
>[Event "?"]
>[Site "?"]
>[Date "2001.06.23"]
>[Round "?"]
>[White "?"]
>[Black "?"]
>[Result "*"]
>[SetUp "1"]
>[FEN "8/p2B4/7p/k1p5/2P2p2/P1K1pP2/3nP2P/8 b - -"]
>
>1... Kb6 {8s} 2. Bf5 {4:46m} Kc7 {53s} 3. h4 {2:00m} Nf1
>{2:19m} 4. Kd3 {2:38m} Ng3 {37s} 5. Bh3 {2:14m} Kd6 {1:46m}
>6. Bc8 {2:34m} Ke7 {1:05m} 7. Ba6 {2:23m} Kf6 {37s} 8. Bb5
>{9:34m} Ke5 {15s} 9. Bd7 {3:37m} Nf5 {7s} 10. Bxf5 {2:07m}
>Kxf5 {1s} 11. Kc2 {6:45m} Ke5 {13s} 12. Kc3 {1:48m} a5
>{33s} 13. a4 {2:57m} Kf6 {48s} 14. Kc2 {3:02m} Kg6 {10s}
>15. Kd3 {2:58m} Kh5 {8s} 16. Ke4 {40s} Kxh4 {7s} 17. Kxf4
>{13s} h5 {7s} 18. Ke5 {4:48m} Kg3 {11s} 19. f4 {4:54m} Kf2
>{12s} 20. f5 {25s} Kxe2 {7s} 21. f6 {3:53m} Kd3 {8s} 22. f7
>{11s} e2 {1:49m} 23. f8=Q {19s} e1=Q+ {8s} 24. Kd6 {4:51m}
>Kxc4 {42s} 25. Qf7+ {6:27m} Kb4 {22s} 26. Qxh5 {5:25m} Qg3+
>{57s} 27. Kc6 {2:17m} Qc3 {27s} 28. Qd5 {2:16m} Kxa4 {10s}
>29. Qd1+ {2:23m} Ka3 {13s} 30. Qd5 {6:36m} a4 {26s} 31. Qd6
>{5:16m} Kb2 {1:18m} 32. Qb8+ {5:42m} Ka1 {3:48m} 33. Qb5
>{2:55m} a3 {29s} 34. Qf1+ {1:43m} Kb2 {9s} 35. Qb5+ {5:02m}
>Qb3 {7s} 36. Qe2+ {1:24m} Qc2 {26s} 37. Qe5+ {3:10m} Kb3
>{37s} 38. Qb8+ {5:54m} Ka2 {9s} 39. Qf8 {5:35m} c4 {2:38m}
>40. Qg8 {3:35m} Kb2 {24s} 41. Qb8+ {13:31m} Kc1 {6s}
>42. Qb4 {16:32m} a2 {5s} * {both show clear winning score for
>black here}
>
>Regards,
>Dieter
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