Author: Jorge Pichard
Date: 01:10:50 04/12/03
Go up one level in this thread
On April 12, 2003 at 04:09:45, Jorge Pichard wrote: >On April 12, 2003 at 01:40:31, Robert Hyatt wrote: > >>On April 11, 2003 at 18:26:32, Jorge Pichard wrote: >> >>>Which Pawn should White push in order to win, please provide Analylis. >>> >>>[D]8/8/3P3P/5r2/2P5/2P4k/8/6K1 w - - 0 1 >> >>My human eye says c5. If Rxc5 then d7 and Rd5 is met by h7 and black is >>pretty well hosed... >> >>The key is getting the rook to a square where it has to prevent >>one pawn from queening from behind, because it can't stop both from >>there, it needs to be on the first rank. >> >>Hence c5 to lure it away. >> >>cute position since Rc5 is not playable and anything else has trouble with >>c6. >> >>I let crafty grind on this after I looked at it and sure enough, at depth >>17 it fails high on c5. Takes 5 minutes to find it however, on my dual 2.8. >> >>Can you show me the Analysis on your dual 2.8 Ghz. > >Yes c5! is the only winning move, but not too many programs can see this, not >even after 5 Minutes. > >1. c5 Kg3 2. h7 Rf8 3. c6 Ra8 4. Kf1 Kf3 5. Ke1 Ke3 6. Kd1 Kd3 7. Kc1 Kxc3 8. >Kd1 Kd3 9. Ke1 Ke3 10. Kf1 Kf3 11. Kg1 Kg3 12. h8=Q Rxh8 13. c7 it must be this >pawn, since the b8 square is a vital one for Black's defense Ra8 14. Kf1 Kf3 15. >Ke1 Ke3 16. Kd1 Kd3 17. Kc1 Kc3 18. Kb1 now there is no check on b8, so White >wins, There will follow 19. d7 and the birth of a queen. > > >If h7?? this is how Black King will stop it and mop the White pawns: >1. h7 Rf8 2. c5 Kg4 3. c6 Kf5 4. d7 Ke6 etc... > > >If d7?? this is how Black King will stop it and mop the White pawns: >1. d7 Rf8 2. c5 Kg3 3. c6 Ra8 4. Kf1 Kf3 5. Ke1 Ke3 6. Kd1 Kd3 7. Kc1 Kxc3 8. >Kb1 Rb8+ 9. Ka2 Ra8+ 10. Kb1 Rb8+ Draw > > >>> >>>------------------------------------------------------------------------------- >>>This is another position of Reciprocal Zugzwang: If White is to play, then he >>>can only draw, but if Black is to play, he loses. In other words, any move by >>>either side weakens his position to the extend of worsening the result of the >>>game! >>> >>>[D]1R4br/8/8/8/8/4K3/k5P1/8 w - - 0 1 >> >>Crafty says g3 is a dead draw.
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