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Subject: Re: Endgame test position

Author: Vincent Diepeveen

Date: 15:42:18 05/15/02

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On May 15, 2002 at 13:22:30, Dann Corbit wrote:

just like Amy its problem seems to be
it doesn't know that

KRB versus KRPP is a draw instead of a win for black.

Otherwise it would go for Rxe7 instantly i guess.

>On May 15, 2002 at 07:46:27, Andrew Williams wrote:
>
>>How long does it take your program to see Rxe7! here?
>>
>>[D]4r1k1/2R1N1b1/8/p7/1p6/6PK/7P/8 b - - bm Rxe7
>
>Pharaon has trouble with it:
>
>test \rxe7.epd 120
>
>Looking for Re8xe7
>
>8   -   - r - k -
>7 -   R   N   b
>6   -   -   -   -
>5 p   -   -   -
>4   p   -   -   -
>3 -   -   -   P K
>2   -   -   -   P
>1 -   -   -   -
>  a b c d e f g h
>4r1k1/2R1N1b1/8/p7/1p6/6PK/7P/8 b - -
> 6.     22    0     7745  Kh8 Nf5 Be5 Ra7 Rf8 Kg4
> 6->    22    0     8965  Kh8 Nf5 Be5 Ra7 Rf8 Kg4
> 7.     27    0    43663  Kh8 Nc6 Ra8 Rb7 Ra6 Nxa5 Rxa5
> 7->    27    0    46673  Kh8 Nc6 Ra8 Rb7 Ra6 Nxa5 Rxa5
> 8.     32    1   175864  Kh8 Rb7 a4 Rxb4 Rxe7 Rxa4 Re2 Ra7
> 8->    32    1   181614  Kh8 Rb7 a4 Rxb4 Rxe7 Rxa4 Re2 Ra7
> 9.     36    1   284580  Kh8 Rb7 a4 Rxb4 Rxe7 Rh4 Kg8 Rxa4 Re2 Ra7
> 9->    36    1   303624  Kh8 Rb7 a4 Rxb4 Rxe7 Rh4 Kg8 Rxa4 Re2 Ra7
>10.      0    3   656231  Kh8 Rb7 Ra8 Ng6 Kh7 Ne7 Kh8 Ng6
>10->     0    4   719632  Kh8 Rb7 Ra8 Ng6 Kh7 Ne7 Kh8 Ng6
>11.      0    5   934092  Kh8 Rb7 Ra8 Ng6 Kh7 Ne7 Kh8 Ng6
>11->     0    6  1040889  Kh8 Rb7 Ra8 Ng6 Kh7 Ne7 Kh8 Ng6
>12.     41   17  3329280  Kh8 Rb7 a4 Rxb4 Rxe7 Rxa4 Re2 Rh4 Kg8 Kg4 Kf7 h3 Bd4
>12->    41   18  3497919  Kh8 Rb7 a4 Rxb4 Rxe7 Rxa4 Re2 Rh4 Kg8 Kg4 Kf7 h3 Bd4
>13.     37   34  6715553  Kh8 Rb7 a4 Rxb4 Rxe7 Rxa4 Re2 Rh4 Kg8 Kg4 Bd4 h3
>                          Kf7 Kf5
>13->    37   36  6984816  Kh8 Rb7 a4 Rxb4 Rxe7 Rxa4 Re2 Rh4 Kg8 Kg4 Bd4 h3
>                          Kf7 Kf5
>14.         120 22945934  Kh8 Rb7 Rxe7
> time:120.01s, nodes:22944403, nps:191201, evals:5420368 (23.6%)
> HT Fill:100.0%, HT Hit:9.40%, HT Refut:6.1%, HP Hit:99.99%, TB: 10135
>Rank#04 :
>14<=    37  120 22945934  Rxe7 Rxe7 Bf8 Re2 a4
>Not found 1: Kh8 played instead of Re8xe7
> 0/1 solved positions in '\rxe7.epd'
>The log file 'log/rxe7.epd.001' has been created.



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