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Subject: Re: 2 very difficult and wild tactical combinations which programs can't see

Author: Dann Corbit

Date: 11:53:31 11/02/01

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Looks like exf3 was the mistake...
Qxf5 holds, according to Yace:

[D]1r1q2k1/7p/2p3p1/p2p1r2/8/BPNQ1nK1/P3P3/3RR3 w - - c0 "after Bxg3 Kxg3 Nxf3";
Stored 8 learned positions into hash table
solution
no solutions
usetime = 998.00, mintime = 998.00 maxtime = 998.00 tl 998.00 ml 0
         7   0.005   0.40  1t  1.Qxf5 gxf5 2.exf3 {29}
        13   0.009   4.63  1t  1.exf3 {530}
        54   0.013   4.63  1.  1.exf3 {530}
       168   0.018   4.40  2t  1.exf3 Qf6 {530}
       704   0.024   4.40  2.  1.exf3 Qf6 {530}
      4455   0.039   4.52  3t  1.exf3 Qg5+ 2.Kh2 Qf4+ 3.Kg2 Kh8 {530}
      5361   0.042   4.52  3.  1.exf3 Qg5+ 2.Kh2 Qf4+ 3.Kg2 Kh8 {530}
     17875   0.078   4.55  4t  1.exf3 Qg5+ 2.Kf2 Qh4+ 3.Kg2 Rg5+ 4.Kf1 Qg3
                               {530}
     19392   0.086   4.55  4.  1.exf3 Qg5+ 2.Kf2 Qh4+ 3.Kg2 Rg5+ 4.Kf1 Qg3
                               {530}
     27850   0.112   4.15  5-- 1.exf3 Qg5+ 2.Kf2 Qh4+ 3.Ke2 Re8+ 4.Kd2 Qf2+
                               5.Re2 Rxe2+ 6.Kc1 {30}
     83755   0.261   3.89  5t  1.exf3 Qg5+ 2.Kh3 Qh5+ 3.Kg2 Rg5+ 4.Kf2 Qh2+
                               5.Ke3 Re8+ 6.Kd4 Qh4+ 7.f4H Qf2+H 8.Re3H Qxf4+H
                               {450}
    100047   0.301   3.89  5.  1.exf3 Qg5+ 2.Kh3 Qh5+ 3.Kg2 Rg5+ 4.Kf2 Qh2+
                               5.Ke3 Re8+ 6.Kd4 Qh4+ 7.f4 Qf2+ 8.Re3 Qxf4+
                               {450}
    102081   0.316   3.49  6-- 1.exf3 Qg5+ 2.Kh3 Qh5+ 3.Kg2 Rg5+ 4.Kf2 Qh2+
                               5.Ke3 Re8+ 6.Be7 Rxe7+ 7.Kd4 {180}
    229125   0.588   2.71  6t  1.exf3 Qg5+ 2.Kh3 Qh5+ 3.Kg2 Rg5+ 4.Kf2 Qh2+
                               5.Ke3 Re8+ 6.Kd4 Qh4+ 7.Ne4 dxe4 {190}
    274330   0.688   2.71  6.  1.exf3 Qg5+ 2.Kh3 Qh5+ 3.Kg2 Rg5+ 4.Kf2 Qh2+
                               5.Ke3 Re8+ 6.Kd4 Qh4+ 7.Ne4 dxe4 {190}
    364943   0.902   2.31  7-- 1.exf3 Qg5+ 2.Kh3 Qh5+ 3.Kg2 Rg5+ 4.Kf2 Qh2+
                               5.Ke3 Re5+ 6.Kd4 Rxe1 7.Ne4 {30}
    494407   1.190   1.31  7-- 1.exf3 Qg5+ 2.Kh3 Rf4 3.Qxg6+ hxg6 4.Rxd5 cxd5
                               5.Nxd5 {-731}
   1200016   2.660   0.00  7t  1.exf3 Qg5+ 2.Kf2 Qh4+ 3.Ke3 Qh6+ 4.Kd4 Qg7+
                               5.Kc5 Qf8+ 6.Kd4 Qf6+ 7.Kc5 Qf8+ {530}
   1291055   2.876   0.01  7t+ 1.Qxf5 gxf5 2.exf3 f4+ 3.Kh3 Rxb3 4.axb3 Qg5
                               {449}
   1546642   3.516   0.56  7t  1.Qxf5 gxf5 2.Kxf3 Qf6 3.Rg1+ Kf7 4.Bb2 Ke6
                               5.Ke3 {29}
   1870013   4.203   0.56  7.  1.Qxf5 gxf5 2.Kxf3 Qf6 3.Rg1+ Kf7 4.Bb2 Ke6
                               5.Ke3 {29}
   2448410   5.635   0.57  8t  1.Qxf5 Qh4+ 2.Kxf3 gxf5 3.Rg1+ Kf7 4.Bc5H Re8H
                               5.Rd3H Qh5+H 6.Kf4H Ke6H {29}
   3165590   7.188   0.57  8.  1.Qxf5 Qh4+ 2.Kxf3 gxf5 3.Rg1+ Kf7 4.Bc5 Re8
                               5.Rd3 Qh5+ 6.Kf4 Ke6 {29}
   4396376  10.179   0.53  9t  1.Qxf5 Qh4+ 2.Kxf3 gxf5 3.Rg1+ Kf7 4.Bc5 Ke6
                               5.Ke3 Re8 6.Rd4 Kd7+ 7.Kd2 {29}
   6685602  14.981   0.53  9.  1.Qxf5 Qh4+ 2.Kxf3 gxf5 3.Rg1+ Kf7 4.Bc5 Ke6
                               5.Ke3 Re8 6.Rd4 Kd7+ 7.Kd2 {29}
  11558491  27.101   0.55 10t  1.Qxf5 Qh4+ 2.Kxf3 gxf5 3.Rh1 Qg4+ 4.Ke3 Re8+
                               5.Kd3 d4 6.Rdg1 Re3+ 7.Kd2 Rg3 8.Rxg3 Qxg3 {29}
  17033674  38.942   0.55 10.  1.Qxf5 Qh4+ 2.Kxf3 gxf5 3.Rh1 Qg4+ 4.Ke3 Re8+
                               5.Kd3 d4 6.Rdg1 Re3+ 7.Kd2 Rg3 8.Rxg3 Qxg3 {29}
  29060447  1:08.3   0.47 11t  1.Qxf5 gxf5 2.Kxf3 Qf6 3.Rg1+ Kf7 4.Rd3 Rg8H
                               5.Rxg8H Kxg8H 6.Bc5H Qg5H 7.Rd4H Kf7H {29}
  48641327  1:52.9   0.47 11.  1.Qxf5 gxf5 2.Kxf3 Qf6 3.Rg1+ Kf7 4.Rd3 Rg8
                               5.Rxg8 Kxg8 6.Bc5 Qg5 7.Rd4 Kf7 {29}
  71566988  2:49.6   0.43 12t  1.Qxf5 gxf5 2.Kxf3 Qf6 3.Rg1+ Kf7 4.Rd3 Qh6
                               5.Bc5 Qh3+ 6.Kf4H Qh4+H 7.Ke3H Qh6+H 8.Kf2H
                               Qh4+H 9.Rgg3H Rg8H {29}
 138568100  5:26.4   0.43 12.  1.Qxf5 gxf5 2.Kxf3 Qf6 3.Rg1+ Kf7 4.Rd3 Qh6
                               5.Bc5 Qh3+ 6.Kf4 Qh4+ 7.Ke3 Qh6+ 8.Kf2 Qh4+
                               9.Rgg3 Rg8 {29}
 208330586  8:19.7   0.38 13t  1.Qxf5 gxf5 2.Kxf3 Qf6 3.Rg1+ Kf7 4.Rd3 Qh4
                               5.Bc5 Qh5+ 6.Ke3 Qh6+H 7.Kf2H Qh4+H 8.Ke3H
                               Qh6+H 9.Kf2H Qh4+H 10.Ke3H Qh6+HR {29}



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