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Subject: Re: An hard test position

Author: pavel

Date: 06:58:00 08/07/00

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On August 07, 2000 at 08:30:35, blass uri wrote:

>[D]6k1/6pp/1Q1pn1rr/p1p1p3/2P1P2q/1P3P1P/P2RN1PK/6R1 w - - 0 1
>
>How much time does your program need to find Rxd6?
>Is it the only right move(I think that it is but I am not sure)?
>
>tiger played in a game Qxd6
>and lost after Qf2 Qb8+?(better was Kh1 but it is also not an easy position for
>programs) Kf7(chessmaster6000's evaluation is mate in 15).
>
>Qb8+ Nf8 seems to be better for black but I could not find a forced win.
>chessmaster admit that it is better for black after a long time and changes its
>mind later to Rxd6 with a draw score.
>
>Uri

this is what crafty thinks

             time surplus   0.00  time limit 30.00 (3:00)
        nss  depth   time  score   variation (1)
               6     3.02   0.17   1. Qxd6 Qf2 2. Qb8+ Kf7 3. Qb7+ Kf6
                                   4. Kh1 Rxh3+ 5. gxh3 Rxg1+ 6. Nxg1
                                   Qxd2
               6     4.08     ++   1. Qxa5!!
               6     7.30   1.63   1. Qb8+ Nf8 2. Qa8 Qf2 3. Qd5+ Kh8
                                   4. Qa8 Kg8 5. Qxa5
               6->   9.49   1.63   1. Qb8+ Nf8 2. Qa8 Qf2 3. Qd5+ Kh8
                                   4. Qa8 Kg8 5. Qxa5
               7    10.41     --   1. Qb8+
               7    14.61   0.95   1. Qb8+ Nf8 2. Qa8 Qf2 3. Qd5+ Kh8
                                   4. Kh1 Rh4 5. Nf4
               7    16.12     ++   1. Qxd6!!
               7->  38.20   1.34   1. Qxd6
               8    40.42     --   1. Qxd6
               8    48.21  -1.01   1. Qxd6 Qf2 2. Kh1 Rxg2 3. Qxe6+ Rxe6
                                   4. Rd8+ Kf7 5. Rd7+ Re7 6. Rxg2 Qxf3
               8    48.87     ++   1. Qb8+!!
               8     1:27   0.63   1. Qb8+ Nf8 2. Qc8 Qf2 3. Qf5 Rf6 4.
                                   Qg4 Rhg6 5. Qh5
               8->   2:38   0.63   1. Qb8+ Nf8 2. Qc8 Qf2 3. Qf5 Rf6 4.
                                   Qg4 Rhg6 5. Qh5
               9     2:54     --   1. Qb8+
               9     3:30   1/38   1. Qb8+





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