Author: Dieter Buerssner
Date: 11:36:35 04/01/02
Go up one level in this thread
On April 01, 2002 at 13:40:13, Roy Eassa wrote:
>
>[d] 8/8/5kpp/3K1p2/5P2/7P/6P1/8 b - - 0 1
>Black to move and draw.
>
>I would think this would be trivially easy for today's programs running on fast
>PCs, but (maybe) it isn't. There are only two first moves for Black that draw;
>everything else loses:
>
>1...g5!
>
> [also drawing is 1...Kf7 2.Kd6
> (2.h4 g5 3.h5 gxf4 4.Ke5 Ke7 5.Kxf5 Kf7 6.Kxf4 Kf6 7.g3 Ke6 =)
> 2...Kf6 3.h4 g5 4.g3 Kg6 5.hxg5
> (5.Ke6 g4=)
> 5...hxg5 6.Ke6 gxf4 7.gxf4 Kg7 8.Kxf5 Kf7 =]
>
> [1...h5? 2.h4 +-
> (2.g3 also wins)]
>
> [1...Ke7? 2.Ke5+-]
>
>2.g3 g4 3.h4
>
> [3.hxg4 fxg4 and Black pushes the pawn to h4 for a simple draw.]
>
>3...Kg6 4.Ke5 Kh5 =
Yace needs a bit of time, to find g5.
1853091 36.172 -0.14 16. 1...h5 2. h4 Ke7 3. Ke5 Kf7 4. Kd6 Kf6 5. Kd7
Kf7 6. g3 Kf6 7. Kd6 Kf7 8. Kc5 Ke7 9. g4 hxg4
10. Kc6 g3 11. Kb5 g2 12. h5
2262485 42.866 -0.54 17-- 1...h5 2. g3 Ke7 3. Ke5 Kf7 4. Kd6 Kf6 5. Kd7
h4 6. gxh4 Kg7 7. Kd6 Kf7 8. Kc5 Kf6 9. Kd5 Kf7
10. Ke5 Ke8H 11. h5H g5H 12. fxg5H f4H {HT}
2543136 48.921 -0.55 17t 1...h5 2. g3 Ke7 3. Ke5 Kf7H 4. Kd6H Kf6H 5.
Kd7H Kf7H 6. Kd8H Kf6H 7. Ke8H g5H 8. Kf8H h4H
9. gxh4H gxh4H 10. Kg8H Kg6H 11. Kh8H Kh5H 12.
Kg8H Kh6H 13. Kf7H Kh7H {0}
3140092 1:09.2 -0.54 17t+ 1...g5 2. g3 g4 3. Kd6 Kg6 4. Ke5 Kh5 5. Kxf5
gxh3 6. g4+ Kh4 7. Ke5 Kg3 8. f5 Kg2 9. f6 h2
10. f7
3435587 1:14.8 -0.24 17t 1...g5 2. g3 g4 3. h4 Kg6 4. Ke5 Kh5 5. Ke6H
Kg6H 6. Ke7H Kh5H 7. Kd6H Kg6H 8. Kd5H Kh5H 9.
Ke5H Kg6H 10. Kd4H Kh5H 11. Kc5H Kg6H 12. Kd5H
Kh5H 13. Ke5H Kg6H 14. Kd4H Kh5H 15. Kc5H Kg6H
16. Kd5HR {0}
3797157 1:26.0 -0.24 17. 1...g5 2. g3 g4 3. h4 Kg6 4. Ke5 Kh5 5. Ke6 Kg6
6. Ke7 Kh5 7. Kd6 Kg6 8. Kd5 Kh5 9. Ke5 Kg6 10.
Kd4 Kh5 11. Kc5 Kg6 12. Kd5 Kh5 13. Ke5 Kg6 14.
Kd4 Kh5 15. Kc5 Kg6 16. Kd5 {0}
4408911 1:38.4 -0.24 18t 1...g5 2. g3 g4 3. h4 Kg6 4. Ke5 Kh5 5. Ke6 Kg6
6. Ke7 Kh5 7. Kd6 Kg6 8. Kd5 Kh5H 9. Ke6H Kg6H
10. Ke7H Kh5H 11. Kd6H Kg6H 12. Kd5H Kh5H 13.
And essentially the same for some time. The fail low for h5 does not look
impressive, but with the next depth, it would be much more negative. For Ke7,
the behaviour is similar. It first looks reasonable, but soon fails low big
time. If I disallow g5 (my "poor man's n-best mode) I get a similar score with
Kf7 as the best move. All on K6-2 475.
Regards,
Dieter
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.