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Subject: Re: simple position not easy for most engines

Author: Dieter Buerssner

Date: 15:10:46 10/03/05

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On October 03, 2005 at 16:04:51, Will Singleton wrote:

> [...] After h8=Q a1=Q, we get this position:
>
>[d]7Q/5p2/8/8/6K1/5P2/k7/q7 w - -

Yace, no TBs:

       907   0.000   0.40  2t  1.Qxa1+ Kxa1 2.Kf5 Kb2 3.Ke5 {0}
      1166   0.000   0.92  2++ 1.Qa8+ Kb2 2.Qb8+ Kc2 3.Qc7+ Kd2 4.Qxf7 {80}
      1283   0.000   1.05  2t  1.Qa8+ Kb2 2.Qb7+ Kc2 3.Qxf7 {80}
      1543   0.000   1.05  2.  1.Qa8+ Kb2 2.Qb7+ Kc2 3.Qxf7 {80}
      2855   0.000   0.93  3t  1.Qa8+ Kb2 2.Qb7+ Kc1 3.Qxf7 Qe5 {80}
      3832   0.000   0.93  3.  1.Qa8+ Kb2 2.Qb7+ Kc1 3.Qxf7 Qe5 {80}
     13563   0.000   0.92  4t  1.Qa8+ Kb2 2.Qb7+ Kc2 3.Qxf7 Qg1+ 4.Kf5 Kd3 {80}
     18471   0.016   0.92  4.  1.Qa8+ Kb2 2.Qb7+ Kc2 3.Qxf7 Qg1+ 4.Kf5 Kd3 {80}
     51490   0.047   0.95  5t  1.Qa8+ Kb2 2.Qb7+ Kc3 3.Qxf7 Qg1+ 4.Kf5 Qc5+
                               5.Kg6 Qg1+H 6.Kf6H Kd3H {80}
     69719   0.063   0.95  5.  1.Qa8+ Kb2 2.Qb7+ Kc3 3.Qxf7 Qg1+ 4.Kf5 Qc5+
                               5.Kg6 Qg1+ 6.Kf6 Kd3 {80}
    132853   0.110   7.78  6++ 1.Qa8+ Kb2 2.Qxa1+ Kxa1 3.Kf5 Kb2 4.f4 Kc2
                               5.Ke5 Kd3 6.f5 Kc4 7.Kd6 f6 8.Ke7 Kc5 9.Kxf6
                               Kd6 10.Kg6H Kd7H {80}
    147631   0.125   8.10  6t  1.Qa8+ Kb2 2.Qxa1+ Kxa1 3.Kf5 Kb2H 4.f4H Kc2H
                               5.Ke5H Kd3H 6.f5H Kc4H 7.Kf6H Kc5H 8.Kxf7H Kd6H
                               9.f6H Kc5H 10.Kg6H Kd4H 11.f7H Ke3H {80}
    161438   0.141   8.10  6.  1.Qa8+ Kb2 2.Qxa1+ Kxa1 3.Kf5 Kb2 4.f4 Kc2
                               5.Ke5 Kd3 6.f5 Kc4 7.Kf6 Kc5 8.Kxf7 Kd6 9.f6
                               Kc5 10.Kg6 Kd4 11.f7 Ke3 {80}
    224719   0.188   8.10  7t  1.Qa8+ Kb2 2.Qxa1+ Kxa1 3.Kf5 Kb2 4.f4 Kc2
                               5.Ke5 Kd3 6.f5 Kc4 7.Kf6 Kc5 8.Kxf7 Kd6 9.f6
                               Kd7 10.Kg6 Kd8 11.f7H Ke7H 12.Kg7H Kd7H
                               13.f8=QH {1001}
    253923   0.219   8.10  7.  1.Qa8+ Kb2 2.Qxa1+ Kxa1 3.Kf5 Kb2 4.f4 Kc2
                               5.Ke5 Kd3 6.f5 Kc4 7.Kf6 Kc5 8.Kxf7 Kd6 9.f6
                               Kd7 10.Kg6 Kd8 11.f7 Ke7 12.Kg7 Kd7 13.f8=Q
                               {1001}
    387004   0.313   8.10  8t  1.Qa8+ Kb2 2.Qxa1+ Kxa1 3.Kf5 Kb2 4.f4 Kc2
                               5.Ke5 Kc3 6.f5 Kd3 7.f6H Kc4H 8.Kd6H Kb5H
                               9.Ke7H Kc6H 10.Kxf7H Kd7H 11.Kg7H Kd6H 12.f7H
                               Kc5H 13.f8=Q+H Kc4H {HT}
    392422   0.328   8.42  8t+ 1.Qxa1+ Kxa1 2.Kf5 Kb2 3.f4 Kc2 4.Ke4 Kd2 5.f5
                               Kc3 6.Kd5 Kb4 7.f6 Kb5 8.Kd6 Kb6 9.Ke7 Kc7H
                               10.Kxf7H Kc8H 11.Kg6H Kd8H 12.f7H Ke7H 13.Kg7H
                               {80}
    398853   0.328   9.92  8++ 1.Qxa1+ Kb3
    400262   0.328  11.02  8++ 1.Qxa1+ Kb3
    637896   0.532  11.44  8t  1.Qxa1+ Kb3 2.Qd4 Kc2 3.Kf5 Kb3 4.f4 Ka3 5.Qa7+
                               Kb3H {1001}
    659581   0.547  11.44  8.  1.Qxa1+ Kb3 2.Qd4 Kc2 3.Kf5 Kb3 4.f4 Ka3 5.Qa7+
                               Kb3 {1001}

Both Qa8 and Qxa1 are seen as winning moves rather fast. Later the PV looks a
bit strange, because the recapture is evaluated very bad.

Regards,
Dieter



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