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Subject: Given Shredder 8 few minutes more, he CAN

Author: Harald Faber

Date: 22:20:49 02/19/04

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On February 19, 2004 at 16:05:07, George Tsavdaris wrote:

>
>30.Nxf7!  A nice sacrifice of Amyan 1.591 against Wildcat 3.0 that some of the
>best engines can't find it in the reasonable time of 4 minutes on a 1.5GHz PIV.
>Shredder 8, Deep Fritz 8-7, Ruffian 2.0 can't find it. It's so easy that i guess
>why? For Junior's and Chess Tiger's is very easy.
>When i'm thinking that Shredder 8 can't see the famous sacrifice Bxh7! and plays
>O-O, i hope programmers of top engines would give more attention to sacrifices
>and be less materialistic.
>
>[D]r2r4/pb3pkp/3q2p1/2pnN3/2B5/1P6/P2QRPPP/4R1K1 w - - 0 30
>

I don't think that 8min on "slow" hardware is too long...

Celeron@1539MHz 300MB hash:

r2r4/pb3pkp/3q2p1/2pnN3/2B5/1P6/P2QRPPP/4R1K1 w - - 0 1

Analysis by Shredder 8:

30.Dc1 f6 31.Sg4 Df4 32.Dxf4 Sxf4 33.Te7+ Kh8 34.Txb7
  +-  (1.44)   Tiefe: 7/18   00:00:00  64kN
30.f3 f6 31.Sg4 Kh8 32.Lxd5 De5 33.Sxe5
  +-  (1.45)   Tiefe: 7/18   00:00:01  92kN
30.f3 Df6 31.Dc2 Kh8 32.Dc1 Tac8 33.Dh6
  +-  (1.47)   Tiefe: 7/18   00:00:01  102kN
30.f3 Df6 31.Dc2 Kh8 32.Db2 Kg8 33.Da3 Db6 34.Lxd5 Lxd5
  +-  (1.47)   Tiefe: 8/20   00:00:01  185kN
30.Dc1 f6 31.Sg4 Df4 32.Dxf4 Sxf4 33.Te7+ Kh8 34.Txb7
  +-  (1.48)   Tiefe: 8/20   00:00:01  192kN
30.Dc1 Tac8 31.f3 Kg8 32.Dh6 f6 33.Sf7
  +-  (1.52)   Tiefe: 8/22   00:00:01  240kN
30.Dc1 Tac8 31.f3 Df6 32.Te4 Kh8 33.Dh6 Dg7 34.Dh4
  +-  (1.59)   Tiefe: 9/19   00:00:02  357kN
30.Dc1 Tf8 31.Sd3 Kh8 32.Te5 Tad8 33.Dh6 f6 34.Te6 Dc7
  +-  (1.62)   Tiefe: 10/24   00:00:07  1080kN
30.Dc1 Tf8 31.f3 Tad8 32.Sg4 Sf6 33.Dh6+ Kh8 34.Sxf6 Dxf6 35.Te7 Dd4+ 36.Kh1 Df2
37.Lxf7
  +-  (1.62)   Tiefe: 11/30   00:00:15  2282kN
30.Dc1 Tf8 31.Sd3 Tac8 32.Te5 Kh8 33.Dh6 Tfd8 34.Lxd5 Lxd5 35.Sf4 Lb7 36.Te7
  +-  (1.66)   Tiefe: 12/28   00:00:27  4055kN
30.Dc1 Tab8 31.Te4 f5 32.T4e2 Df8 33.Sd3 Kh8 34.Lxd5 Dg7 35.Lxb7 Txd3
  +-  (1.75)   Tiefe: 13/33   00:01:09  10811kN
30.Dc1 Tac8 31.Te4 h5 32.Dg5 Df6 33.Sxf7 Dxg5 34.Sxg5 Ta8 35.g3 Se3
  +-  (1.79)   Tiefe: 14/34   00:02:22  22264kN
30.Dc1 Tac8 31.Sg4 Df4 32.Dxf4 Sxf4 33.Te7 Ld5 34.Lxd5 Txd5 35.Se5 Tcd8 36.Sxf7
T8d7 37.Txd7 Txd7 38.Se5 Td6
  +-  (1.70)   Tiefe: 15/37   00:03:17  31220kN
30.Dc1 Tac8 31.Te4 f5 32.T4e2 Tc7 33.Sd3 Df6 34.Lxd5 Lxd5 35.Sxc5 Kh8 36.Te8+
Txe8 37.Txe8+ Lg8 38.a3 Te7
  +-  (1.78)   Tiefe: 16/39   00:07:34  70351kN
<b>30.Sxf7 Kxf7 31.Dh6 Th8 32.Te5 Df8 33.Lxd5+ Lxd5 34.Df4+ Kg7 35.Dxf8+ Taxf8
36.Txd5 Kf6
  +-  (1.79)   Tiefe: 16/40   00:07:57  74122kN</b>
30.Sxf7 Kxf7 31.Dh6 Th8 32.Te5 Df8 33.Lxd5+ Lxd5 34.Df4+ Kg7 35.Dxf8+ Taxf8
36.Txd5 Kf6 37.Txc5 Te8 38.Tcc1 Thg8 39.Txe8 Txe8 40.a3
  +-  (2.14)   Tiefe: 16/40   00:08:10  76552kN
30.Sxf7 Kxf7 31.Dh6 Td7 32.Dxh7+ Kf6 33.Dh4+ Kg7 34.Te6 Df4 35.Te7+ Txe7
36.Txe7+ Kf8 37.Dxf4+ Sxf4 38.Txb7 Ke8 39.g3 Kd8 40.gxf4 Tb8 41.Txb8+
  +-  (4.47)   Tiefe: 16/44   00:11:41  114639kN
30.Sxf7 Kxf7 31.Dh6 Th8 32.Te5 Tad8 33.Lxd5+ Lxd5 34.Df4+ Kg7 35.Te7+ Kg8
36.Te8+ Txe8 37.Txe8+ Kg7 38.Dxd6 Txe8 39.Kf1 Lf7 40.Dxc5 a6 41.Dd4+ Kg8 42.Da7
Te6 43.g3 Kg7
  +-  (4.52)   Tiefe: 17/45   00:14:37  144923kN





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