Author: Simon Finn
Date: 08:01:15 10/04/01
Go up one level in this thread
On October 04, 2001 at 09:59:03, Simon Finn wrote: >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 = Whoops! 17... Kf5 18. Ke1 Ke5 19. Kf1 Kf4 -+ > >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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