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Subject: Null move? Pruning?

Author: Jaime Benito de Valle Ruiz

Date: 16:29:18 01/31/04


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 - -

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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