Author: Mike Byrne
Date: 07:16:59 12/07/03
Go up one level in this thread
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.
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