Author: Robert Hyatt
Date: 21:44:49 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.
17 14.62 1.28 1. d7 Rf8 2. c5 Kg3 3. h7 Ra8 4. Kf1
Kf3 5. Ke1 Ke3 6. Kd1 Kd3 7. Kc1 Kxc3
8. Kd1 Kd3 9. h8=Q Rxh8 10. c6
17 5:18 ++ 1. c5!!
>
>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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