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Subject: Re: classical bishop sac, which program finds it in acceptable time?

Author: Dan Newman

Date: 02:50:53 09/25/00

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On September 24, 2000 at 10:42:01, Harald Faber wrote:

>I'd suggest 30mins.
>
>[D]rnbqr1k1/pp2bppp/4p3/2ppP3/3P3P/2NB1N2/PPP2PP1/R2QK2R w KQ - bm Bd3h7;id
>Faber-Lautenschuetz;

Shrike on a P3/933 finds it in a little over 4 mins:

 1.     -41     0.00         3 dxc5 Bxc5
 1.     -40     0.00        55 h5
 1>     -40     0.00        91 h5
 2.     -41     0.00       146 h5 Qa5 dxc5 Bxc5
 2+     -23     0.00       300 dxc5
 2.     -19     0.00       375 dxc5 Bxc5 O-O
 2>     -19     0.00       804 dxc5 Bxc5 O-O
 3.     -29     0.00      1216 dxc5 Bxc5 O-O d4
 3.     -27     0.00      2514 Bb5 Nc6 O-O
 3>     -27     0.00      2664 Bb5 Nc6 O-O
 4.     -23     0.00      4040 Bb5 Nc6 dxc5 Bxc5 O-O
 4>     -23     0.02      7522 Bb5 Nc6 dxc5 Bxc5 O-O
 5.     -33     0.02      9873 Bb5 Nc6 dxc5 Bxc5 O-O d4
 5.     -25     0.03     17853 dxc5 Bxc5 O-O d4 Na4 Bb4
 5>     -25     0.04     27596 dxc5 Bxc5 O-O d4 Na4 Bb4
 6.     -15     0.12     72977 dxc5 Bxc5 O-O d4 Na4 Bb4 h5
 6>     -15     0.17    110691 dxc5 Bxc5 O-O d4 Na4 Bb4 h5
 7.     -15     0.47    280208 dxc5 Bxc5 Qd2 d4 Na4 Be7 O-O-O Nc6
 7>     -15     0.78    472094 dxc5 Bxc5 Qd2 d4 Na4 Be7 O-O-O Nc6
 8.     -11     1.43    950846 dxc5 Bxc5 Qd2 Bd7 O-O-O Qb6 Rf1 d4 Ne4
 8>     -11     1.80   1318863 dxc5 Bxc5 Qd2 Bd7 O-O-O Qb6 Rf1 d4 Ne4
 9.     -15     3.01   2440128 dxc5 Bxc5 Qd2 Qa5 Bb5 Nc6 O-O-O Qb4 h5 d4
 9>     -15     4.75   3594393 dxc5 Bxc5 Qd2 Qa5 Bb5 Nc6 O-O-O Qb4 h5 d4
10.     -11    12.62  11017276 dxc5 Bxc5 O-O Be7 h5 Nc6 Nb5 Bc5 Qd2 Nb4
                               h6 Nxd3 cxd3
10>     -11    17.73  16018870 dxc5 Bxc5 O-O Be7 h5 Nc6 Nb5 Bc5 Qd2 Nb4
                               h6 Nxd3 cxd3
11.     -12    41.92  38295909 dxc5 Bxc5 Qd2 Nc6 O-O-O d4 Ne4 Bb4 Qg5 Be7
                               Qg4 Qc7
11>     -12    55.13  50806561 dxc5 Bxc5 Qd2 Nc6 O-O-O d4 Ne4 Bb4 Qg5 Be7
                               Qg4 Qc7
12.       3     2:21 130690059 dxc5 Bxc5 Qd2 Bd7 O-O-O Qb6 Ng5 h6 Nh3 Qc7
                               Qf4 d4 Ne4
12+      21     4:05 227389337 Bxh7+
12.      30     4:31 251373577 Bxh7+ Kxh7 Ng5+ Bxg5 hxg5+ Kg8 Qh5 Kf8 Qh8+ Ke7
                               Qxg7 Nd7 g6 Rf8 O-O-O Ke8 gxf7+ Rxf7 Qg8+ Nf8
                               dxc5 Rxf2
12>      30     4:45 265499868 Bxh7+ Kxh7 Ng5+ Bxg5 hxg5+ Kg8 Qh5 Kf8 Qh8+ Ke7
                               Qxg7 Nd7 g6 Rf8 O-O-O Ke8 gxf7+ Rxf7 Qg8+ Nf8
                               dxc5 Rxf2
13.      23     6:51 384139289 Bxh7+ Kxh7 Ng5+ Bxg5 hxg5+ Kg8 Qh5 Kf8 Qh8+ Ke7
                               Qxg7 cxd4 g6 Rf8 Qf6+ Kd7 g7 dxc3 gxf8=Q Qxf8
                               bxc3 Qe7

-Dan.



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