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Subject: Re: Null move? Pruning?

Author: Tony Werten

Date: 02:32:22 02/01/04

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On January 31, 2004 at 19:29:18, Jaime Benito de Valle Ruiz wrote:

>I came across this position almost by accident. A few moves before this, my
>"poor engine" was giving a huge score for white in no time, while Ruffian
>sticked to draw. So I reanalized the whole thing.
>Why can't Ruffian 1.05 find an easy 1.Qd5 and win? Null move? Special Pruning?
>
>[d]Q7/8/1p1K4/1p6/2k5/8/1P6/4q3 w - -

XiniX needs 12 ply (8 sec) to fail high on Qd5 (from Qa2) but then immediately
starts throwing with checkmate scores.

Tony

>
>Ruffian_105  UCI 60 MB:
>D1  00:00  -2.11   b2b3 Kc4xb3
>D1  00:00  -0.98   Kd6c6
>D1  00:00  -0.24   Qa8c6 Kc4b4 Qc6xb6
>D2  00:00  -0.24   Qa8c6 Kc4b4 Qc6xb6
>D2  00:00  -0.16   Qa8d5 Kc4b4 Kd6c6 Qe1e3 Qd5xb5
>D2  00:00  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D3  00:00  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D4  00:00  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D5  00:00  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D6  00:00  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D7  00:00  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D8  00:00  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D9  00:00  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D10  00:00  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D11  00:00  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D12  00:01  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D13  00:04  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D14  00:08  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D15  00:17  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D16  00:33  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D17  01:04  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2
>D18  02:02  0.00   Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2



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