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Subject: Re: One easy mate to solve.

Author: Heiner Marxen

Date: 14:56:39 06/01/01

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On May 25, 2001 at 17:12:42, leonid wrote:

>Hello!
>
>If you want to solve one easy mate then why not try this:
>
>[D]2nbkn2/1P1pp1P1/1qPrPq1r/B2N3b/3PN3/q1RB4/3K2Q1/5R2 w - -
>
>Please indicate your result.
>
>Thanks,
>Leonid.

On a K7/600 with 30 MB hash Chest needs 101 seconds to find a mate in 8:

Nexf6+ exf6 Bg6+ Rxg6 Qxg6+ Bxg6 Nxf6+ Bxf6 bxc8Q+ Ke7 gxf8Q+ Kxe6 Qxf6+ Kd5 Qe5

Was it too easy for the playing programs?  Crafty 17.7 on the same hardware
with 96M hash says:

         (2)    6->  53.95  21.91   1. Nxd6+ Qxd6 2. Nxf6+ exf6 3. cxd7+
                                    Qxd7 4. exd7+ Nxd7 5. Re1+ Ne7 6. g8=Q+
                                    Nf8 7. Bxb6 Bf7 8. Bxd8 Bxg8 9. b8=Q
                7    54.11     ++   1. Nxd6+!!
                7     1:45  24.22   1. Nxd6+ Qxd6 2. Nxf6+ exf6 3. cxd7+
                                    Qxd7 4. exd7+ Nxd7 5. g8=Q+ Nf8 6.
                                    Bxb6 Bf3 7. Qxf3
                7     3:43     ++   1. Nexf6+!!
                7     5:03  Mat08   1. Nexf6+ exf6 2. Qg6+ Rxg6 3. Bxg6+
                                    Nxg6 4. Nxf6+ Bxf6 5. g8=Q+ Nf8 6.
                                    bxc8=Q+ Qd8 7. Qxd8+ Bxd8 8. Qxf8#

It appears to be not easy, but also not very hard.

Cheers,
Heiner



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