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Subject: Re: King and pawn game tuner for your program

Author: Robert Hyatt

Date: 14:16:02 06/27/02

Go up one level in this thread


On June 27, 2002 at 16:10:20, J. Wesley Cleveland wrote:

>On June 27, 2002 at 13:38:32, Ferdinand S. Mosca wrote:
>
>>
>>The king and pawn game is a very interesting exercise to program, is it
>>difficult to perfect this ending?.
>>
>>How long will it take your favorite programs to see that 36. h5 is good for
>>black.
>>[D]8/k6p/8/2P2p2/2P1p3/7K/1P3P2/8 b - - 0 35
>
>My modified crafty likes h5 after 4 secs, but takes 9 minutes to see it is
>winning on a PIII 450, 192m hash.

Something seems wrong.  Mine finds it _very_ quickly...



>
>12->   3.96   1.24   1. ... h5 2. b4 f4 3. c6 e3 4. c7 Kb7
>                     5. c8=Q+ Kxc8
>13     5.45   1.50   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     exf3 5. Kf2 Kd7 6. b5 Ke6 7. b6 Kd7
>                     8. Kxf3
>13->   5.81   1.50   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     exf3 5. Kf2 Kd7 6. b5 Ke6 7. b6 Kd7
>                     8. Kxf3
>14     7.88     ++   1. ... h5!!
>14     8.49     --   1. ... h5
>14    10.76   1.02   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     exf3 5. Kxf3 h4 6. Kf4 Kd7 7. b5 Kd8
>                     8. b6 h3
>14->  11.21   1.02   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     exf3 5. Kxf3 h4 6. Kf4 Kd7 7. b5 Kd8
>                     8. b6 h3
>15    11.82     --   1. ... h5
>15    16.21   1.43   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. b6 Kc6 7. Kf2 h4 8.
>                     Ke3 h3
>15->  17.47   1.43   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. b6 Kc6 7. Kf2 h4 8.
>                     Ke3 h3
>16    26.85     ++   1. ... h5!!
>16    27.24   1.03   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. b6 Kc6 7. Kf2 h4 8.
>                     Kg2 e3 9. Kf3
>16->  28.00   1.03   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. b6 Kc6 7. Kf2 h4 8.
>                     Kg2 e3 9. Kf3
>17    36.85   0.67   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb8 9. b6 Kb7 10. Kf2 h4
>17->  38.27   0.67   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb8 9. b6 Kb7 10. Kf2 h4
>18    40.43     --   1. ... h5
>18    57.71   1.03   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kd7 5. b5 Kc7 6. c6 Kb6 7. c7 Kxc7
>                     8. c5 Kb7 9. Kf2 Kc8 10. Ke3 h4
>18->   1:00   1.03   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kd7 5. b5 Kc7 6. c6 Kb6 7. c7 Kxc7
>                     8. c5 Kb7 9. Kf2 Kc8 10. Ke3 h4
>19     1:15     ++   1. ... h5!!
>19     1:34   0.39   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb7 9. b6 Kc6 10. Kf2 h4 11.
>                     Ke3 h3
>19->   1:38   0.39   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb7 9. b6 Kc6 10. Kf2 h4 11.
>                     Ke3 h3
>20     2:24     ++   1. ... h5!!
>20     3:09  -0.11   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb7 9. b6 Kc6 10. Kf2 h4 11.
>                     Ke3 h3 12. Kf2
>20->   3:13  -0.11   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb7 9. b6 Kc6 10. Kf2 h4 11.
>                     Ke3 h3 12. Kf2
>21     3:52     ++   1. ... h5!!
>21     4:35  -0.74   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb7 9. b6 Kc6 10. Kf2 h4 11.
>                     Ke3 h3 12. Kf2 e3+ 13. Kf3
>21->   4:42  -0.74   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb7 9. b6 Kc6 10. Kf2 h4 11.
>                     Ke3 h3 12. Kf2 e3+ 13. Kf3
>22     5:42  -0.79   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb8 9. b6 Kb7 10. Kf2 h4 11.
>                     Kg2 e3 12. Kf3 h3 13. Kg3
>22->   5:50  -0.79   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb8 9. b6 Kb7 10. Kf2 h4 11.
>                     Kg2 e3 12. Kf3 h3 13. Kg3
>23     6:57     ++   1. ... h5!!
>23     8:41  -3.70   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb7 9. b6 Kc6 10. Kh4 e3 11.
>                     b7 Kxb7 12. Kg3 h4+ 13. Kf3 h3 14.
>                     Kg3 Kc6
>23->   8:58  -3.70   1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. f4
>                     Kc7 5. b5 Kb7 6. c6+ Kb6 7. c7 Kxc7
>                     8. c5 Kb7 9. b6 Kc6 10. Kh4 e3 11.
>                     b7 Kxb7 12. Kg3 h4+ 13. Kf3 h3 14.
>                     Kg3 Kc6



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