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Subject: Re: WAC 230 - Rb4 found by Fritz 6 (<20 min.)

Author: Dann Corbit

Date: 10:53:33 03/16/01

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On March 16, 2001 at 09:02:09, Robert Hyatt wrote:
[snip]
>Crafty has solved this many times on fast hardware.  Here is a run from a
>21264/600mhz alpha, produced by Tim Mann last year:
>               15->   5.04   1.88   1. ... Rh7 2. Rb1 Rh5 3. Kg4 Bb7 4.
>                                    Ba3 Kd7 5. Bc5 Rh2 6. Kg3 Rh8 7. Rb2
>                                    Rh5 8. Kf4 Rh2
>               16    11.66   1.88   1. ... Rh7 2. Rb1 Bb7 3. Ra1 Ba6 4.
>                                    Rb1 Rf7 5. Ba3 Rf5 6. f4 Kd7 7. Rb2
>                                    Bb5 8. Bd6 Bc6 9. Kf3
>               16    27.49     ++   1. ... Rb4!!
>               16    41.84   2.96   1. ... Rb4 2. cxb4 a4 3. Rb1 Kb5 4.
>                                    f3 a3 5. Ra1 b2 6. Rxa3 b1=Q 7. Ra5+
>                                    Kb6 8. Bc5+ Kb7 9. Rb5+ Kc6 10. Rb6+
>                                    Kc7 11. b5 Qf5
>               16->  41.84   2.96   1. ... Rb4 2. cxb4 a4 3. Rb1 Kb5 4.
>                                    f3 a3 5. Ra1 b2 6. Rxa3 b1=Q 7. Ra5+
>                                    Kb6 8. Bc5+ Kb7 9. Rb5+ Kc6 10. Rb6+
>                                    Kc7 11. b5 Qf5
>
>Took that machine 27.5 seconds to find this...

I think something has changed in the eval, since it does not get found any more,
even at very, very long time control.




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