Author: Simon Finn
Date: 06:59:03 10/04/01
Go up one level in this thread
On October 04, 2001 at 02:16:42, Ed Schröder wrote: >On October 03, 2001 at 19:49:56, Slater Wold wrote: > >>On October 03, 2001 at 15:45:32, José Antônio Fabiano Mendes wrote: >> >>> Taimanov-Zakharov,USSR 1969 === Black to move and win >>> [D]8/5p2/7p/5pk1/8/5KPP/8/8 b >>> Source: http://chesscafe.com/text/secpawnendings.txt >> [snip] >I also get 1..h5 with a +2.4 score so I really wonder if 1..Kf6 is the >move to win. 1...h5! is definitely best. Karsten & Mueller's 1...Kg6 2. Ke3 Kg7 is less convincing, since 3. Kf3! h5 (3... Kh7 4. Kf4 Kg6 5. Ke3 etc) 4. Ke3 Kh6 5. Kf3 Kg5 6 h4+ is just a long-winded way to reach the main line after 1...h5! Instead, after 1...Kf6 2. Kf4 Ke6 3. Ke3 Ke5 4. Kf3 [D]8/5p2/7p/4kp2/8/5KPP/8/8 b we get an even harder (6 ply deeper) test position. Black can win only by retracing his steps: 4...Kf6 5. Kf4 Kg6 6. Ke3 Kg5 7. Kf3 h5! etc because 4...f6? 5. g4 = 4...f4? 5. gxf4+ Kd5 (5...Kf5 6. Ke3) 6. Kg4 Ke4 7. Kh5 Kxf4 8. Kxh6 = 4...h5 5. Ke3 f4+? (5...Kf6! 6. Kf4 Kg6 7. Kf3 Kg5 -+) 6. gxf4+ Kd5 7. Kd3! f6 8. Ke3 f5 (8...Kc4 9. Ke4) 9. Kd3 h4 10. Ke3 Kc4 11. Kf3 Kd4 12. Kf2 Ke4 13. Ke2 Kxf4 14. Kf2 Ke4 15. Ke2 f4 16. Kf2 f3 17. Kf1 Ke3 18. Ke1 Kf4 19. Kf2 = That's why 1...h5 is best - Black can't win unless he forces White to advance his h-pawn. > >Ed > [snip] >00:04:21 31.00 2.36 1..h5 2.h4+ Kg6 3.Ke3 Kg7 4.Kf3 > f6 5.Kf4 Kg6 6.Ke3 Kf7 7.Kf3 Kg7 > 8.Kf4 Kg6 9.Ke3 Kf7 10.Kf3 (203) The score is convincing but the PV isn't. What causes the repetition? Simon
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