Author: Uri Blass
Date: 07:28:01 12/07/03
Go up one level in this thread
On December 07, 2003 at 10:16:59, Mike Byrne wrote:
>On December 07, 2003 at 05:30:25, Dana Turnmire wrote:
>
>>On December 06, 2003 at 20:01:10, Martin Andersen wrote:
>>
>>>On December 06, 2003 at 18:10:23, Dana Turnmire wrote:
>>>
>>>
>>>>>[d] 4k3/5ppp/8/8/8/8/PPP5/3K4 w - -
>>>>>
>>>>>{The main variation is } 1. Ke2 Kd7 2. Kf3 Kc6 3. a4 h5 4. c4 f5 5. Kg3 Kb6 6.
>>>>>b4 g5 {or ...g6 7.a5+ Ka6 8.c5 Kb5 9.Kg2 g5 (or 9...h4 10.Kh2! f4 11.Kg1!! g5
>>>>>12.Kg2 g4 13.Kg1, etc.) 10.Kg3 g4 11.Kf2! f4 12.Kg2 h4 13.Kg1!! f3 14.Kf2 h3
>>>>>15.Kg3, and now the Black king must move, allowing a White pawn to queen.} 7.
>>>>>a5+ Ka6 {7...Kb7 8.c5} 8. c5 h4+ 9. Kh3 f4 {or 9...Kb5 10.Kh2, as in the
>>>>>variation above} 10. c6 f3 11. b5+ Ka7 12. c7 g4+ {or 12...Kb7 13.b6 g4+
>>>>>14.Kh2 g3+ 15.Kg1 h3 16.a6+ Kc8 17.a7} 13. Kxg4 f2 14. c8=Q f1=Q 15. b6+
>>>>>{mate} 1-0
>>>
>>>Deep analysis with Crafty 19.6 in Scid 3.5beta1 (long analysis fixed) does
>>>not show a winning score for white:
>>>
>>>Depth: 22 Nodes: 5002768K (980 kn/s)
>>>Score: +0.41 Time: 5106.68 seconds
>>>1. a4!!
>>>
>>>
>>>20 +0.52 1. a4 Kd7 2. a5 Kc6 3. c4 h5 4. b4 h4 5. b5+ Kb7 6. a6+ Ka7 7. Ke2 h3
>>>8. Kf3 g5 9. Kf2 g4 10. Kg3 f6 11. c5 f5 (815.50)
>>>21 +0.01 1. a4 Kd7 2. a5 Kc6 3. Ke2 Kb5 4. b4 h5 5. Kf3 h4 6. Kg4 g5 7. Kh3 Ka6
>>>8. Kg4 Kb5 (1428.98)
>>>21 +0.01 1. a4 Kd7 2. a5 Kc6 3. Ke2 Kb5 4. b4 h5 5. Kf3 h4 6. Kg4 g5 7. Kh3 Ka6
>>>8. Kg4 Kb5 (2009.08)
>>>21 +0.01 1. a4 Kd7 2. a5 Kc6 3. Ke2 Kb5 4. b4 h5 5. Kf3 h4 6. Kg4 g5 7. Kh3 Ka6
>>>8. Kg4 Kb5 (2034.61)
>>>22 +0.01 1. a4 Kd7 2. a5 Kc6 3. Ke2 Kb5 4. b4 h5 5. Kf3 h4 6. Kg4 g5 7. Kh3 Ka6
>>>8. Kg4 Kb5 (2378.38)
>>>22 +0.01 1. a4 Kd7 2. a5 Kc6 3. Ke2 Kb5 4. b4 h5 5. Kf3 h4 6. Kg4 g5 7. Kh3 Ka6
>>>8. Kg4 Kb5 (2684.72)
>>>22 +0.01 1. a4 Kd7 2. a5 Kc6 3. Ke2 Kb5 4. b4 h5 5. Kf3 h4 6. Kg4 g5 7. Kh3 Ka6
>>>8. Kg4 Kb5 (3064.37)
>>>22 +0.41 1. a4!! (3256.86)
>>>22 +0.41 1. a4!! (4813.42)
>>>22 +0.41 1. a4!! (5106.68)
>>>
>>>Martin.
>>
>>It looks like Crafty made a mistake by starting off with a4! and then advancing
>>to a5. Here is how Genius 7 on an AMD 1800+ played it at 2 minutes/move. I can
>>replay it with the PV if you wish.
>>
>>
>>[Event "?"]
>>[Site "?"]
>>[Date "0000.??.??"]
>>[Round "?"]
>>[White "Genius 7"]
>>[Black "Genius 7"]
>>[Result "*"]
>>[FEN "4k3/5ppp/8/8/8/8/PPP5/3K4 w - -"]
>>
>>1. Ke2 Kd7 2. a4 Kc6 3. a5 Kb5 4. b4 h5 5. Kf3 g5 6. c3 h4 7. c4+ Ka6 8. c5
>>Kb5 9. Kg4 f6 10. Kh3 f5 11. Kh2 g4 12. Kg2 h3+ 13. Kg3 f4+ 14. Kh2 f3 15. Kg3
>>f2 16. Kxf2 h2 17. Kg2 g3 18. Kh1 Kxb4 *
>
>This is a forced whin for white. It was (maybe still is) a chess variation game
>that can be played by ICC. At one time, I was actually building a book that
>Crafty would play this perfectly. 1.a4 follwed 2.a5 is wrong. The game will
>end up with zugswang position with whoever moves loses. There are humans that
>learned how to play this perfectly everytime - but I was not one of them. I
>believe null move engines have diffculty playing this ending.
I believe that engines usually do not use null move in these kind of
positions(pawn endgames)
Uri
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