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Subject: Re: Fairly simple endgame position

Author: Thomas McBurney

Date: 04:47:50 06/06/03

Go up one level in this thread


On June 06, 2003 at 05:40:21, Lyn Harper wrote:

>  [D]k7/5p2/4pP2/4P3/3P4/8/8/4K3 - - w
>
>   Hope the diagram comes out :)
>  Goood old CM9k does it in pretty short order, without EGDB. About 1min18sec on
>my Athlon 2400.   But Ruffian, Genius7 and Green Light Chess are stumped ,even
>after about 10min.
>   I don't have Fritz or Shredder. The old Chessica got it in over 5min.
>   How does your proggy do?

That's very interesting.

My winboard engine Kanguruh (written in BASIC) found it in less than a second.

  1    112      25           1  e1d2
  2    111      25          10  e1d2 a8b7
  3    112      25          44  e1d2 a8b7 d2e3
  4    110      25         140  e1d2 a8b7 d2e3 b7c6
  5    111      24         472  e1d2 a8b7 d2e3 b7c6 e3e4
  6    111      23        1471  e1d2 a8b7 d2e3 b7c6 e3e4 c6b5
  7    110      18        5221  e1d2 a8b7 d2e3 b7c6 e3e4 c6b5 d4d5
  7    110      16        7035  e1f2 a8b7
  7    110      10       13007  d4d5 e6d5 e5e6 f7e6 f6f7 e6e5 f7f8 a8a7
  8    622       8       14867  d4d5 e6d5 e5e6 f7e6 f6f7 a8a7 f7f8 e6e5
  9    704       3       26639  d4d5 e6d5 e5e6 f7e6 f6f7 a8b7 f7f8 b7c6 e1d2
 10    764      45       66371  d4d5 e6d5 e5e6 f7e6 f6f7 a8b7 f7f8 b7c6 f8e7
d5d4
 11    766     149      174174  d4d5 e6d5 e5e6 f7e6 f6f7 a8b7 f7f8 b7c6 f8d8
c6b5 d8e8 b5a5
 12    766     563      577212  d4d5 e6d5 e5e6 f7e6 f6f7 a8b7 f7f8 b7c6 f8d8
c6b5 d8e8 b5a5 e8e6
 13    807    2132     2161586  d4d5 e6d5 e5e6 f7e6 f6f7 a8b7 f7f8 b7c6 f8e7
c6b5 e1d2 b5a5 e7e6
 14    807    5494     5866649  d4d5 e6d5 e5e6 f7e6 f6f7 a8b7 f7f8 b7c6 f8e7
c6b5 e7e6 b5c5 e1d2 c5c4


My other chess program, Deep BASIC which is written in QB45 surprisingly found
the correct answer in a second. Not bad for a 16 bit DOS program struggling to
get 4000 nps on my Athlon 650.   But then changes its mind to Kd2 but still
shows the pawn exchanges one move later.  After a few more minutes it changes
its mind again to d5.  Can anybody tell me if Kd2 is still ok if the pawn
sacrifices are played next move?

MOVE     TIME    SCORE DEPTH LINE

  1.  ...

  1.       0s     1.11 ( 2) E1D2 A8B7
  1.       0s    -0.10 ( 3) E1D2 A8B7 D4D5
  1.       0s     1.11 ( 3) E1D2 A8B7 D2C3
  1.       0s     1.12 ( 3) E1D2 A8B7 D2E3
  1.       0s     1.12 ( 4) E1D2 A8B7 D2E3 B7A8
  1.       0s     1.10 ( 4) E1D2 A8B7 D2E3 B7C6
  1.       0s    -0.10 ( 5) E1D2 A8B7 D2E3 B7C6 D4D5
  1.       0s     1.10 ( 5) E1D2 A8B7 D2E3 B7C6 E3F4
  1.       0s     1.11 ( 5) E1D2 A8B7 D2E3 B7C6 E3E4
  1.       0s     1.12 ( 6) E1D2 A8B7 D2E3 B7C6 E3E4 C6B7
  1.       0s     1.11 ( 6) E1D2 A8B7 D2E3 B7C6 E3E4 C6D7
  1.       1s     7.00 ( 6) D4D5 E6D5 E5E6 F7E6 F6F7 D5D4
  1.       1s     6.82 ( 7) D4D5 E6D5 E5E6 F7E6 F6F7 D5D4 F7F8
  1.       1s     6.70 ( 7) D4D5 E6D5 E5E6 F7E6 F6F7 E6E5 F7F8
  1.       2s     6.70 ( 8) D4D5 E6D5 E5E6 F7E6 F6F7 E6E5 F7F8 A8B7
  1.       2s     6.68 ( 8) D4D5 E6D5 E5E6 F7E6 F6F7 E6E5 F7F8 A8A7
  1.       5s     7.00 ( 8) E1D2 A8B7 D4D5 E6D5 E5E6 F7E6 F6F7 D5D4
  1.      17s     6.82 ( 9) E1D2 A8B7 D4D5 E6D5 E5E6 F7E6 F6F7 D5D4 F7F8
  1.      17s     6.70 ( 9) E1D2 A8B7 D4D5 E6D5 E5E6 F7E6 F6F7 E6E5 F7F8
  1.     171s     6.69 ( 9) E1D2 A8A7 D4D5 E6D5 E5E6 F7E6 F6F7 E6E5 F7F8
  1.     285s     7.00 ( 9) D4D5 E6D5 E5E6 F7E6 F6F7 D5D4 F7F8 A8B7 F8G7
  1.     328s     8.06 (10) D4D5 E6D5 E5E6 F7E6 F6F7 D5D4 F7F8 A8B7 F8G7 B7A8
  1.     328s     7.88 (10) D4D5 E6D5 E5E6 F7E6 F6F7 E6E5 F7F8 A8B7 F8G7 B7A8
  1.     330s     7.86 (10) D4D5 E6D5 E5E6 F7E6 F6F7 A8B7 F7F8 B7C6 F8E7 D5D4

Cheers,
Tom



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