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Subject: Re: Buggy eval from shredder 8

Author: Ingo Bauer

Date: 09:45:47 09/18/04

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On September 18, 2004 at 10:27:21, Vincent Lejeune wrote:

>I suspect this is a bug from a penalty due to "trojan horse" concept : h file
>get open with rook and queen on this file ...
>
>Anyone can confirm ?  Stefan Meyer-Kahlen ? :>

Hello

If you are right (and I suspect you are) then these trojan horse effect can't be
considered a bug because it is happening on purpose, right!?

>>This -3.56 is totally unrealistic, even Shredder is unable to find a score lower
>>than -1.00  in folling moves !!!

What I can not confirm is that Shredder is not going below the  -1 in the
following moves. Just play the 17. fxg4 and S8th eval goes like this:

[D]2k4r/1pp2pp1/pbp5/7p/1P2P1Pq/7P/P1PQ1P2/1RB1R1K1 b - -

Engine: Shredder 8 (256 MB)
by Stefan Meyer-Kahlen

11/28  0:01   +0.45    17...hxg4 18.Re3 gxh3 19.Kh2 Bxe3
                       20.Qxe3 Qg4 21.Qg3 Qxe4 22.Bb2 Qxc2
                       23.Bxg7 Rg8 24.Qxh3+ f5 (575.746) 442

12/32  0:02   +0.70++  17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 Qh5+
                       23.Kf4 Rh6 24.Qf2 (1.158.795) 446

12/32  0:02   +0.76    17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 Qh5+
                       23.Kf2 Qd1 24.Qd3 Rh2+ 25.Ke3 Qg1+
                       26.Kf4 Qf2+ 27.Qf3 Qxc2 28.Qg4+ Kb8
                       29.Bd2 (1.315.320) 445

13/36  0:04   +0.51--  17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 Qh5+
                       23.Kf4 Rh6 24.Bb2 Rf6+ 25.Bxf6 Qf3+
                       26.Kxf3 (1.863.743) 447

13/36  0:05   +0.51    17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 Qh5+
                       23.Kf4 f5 24.Qc5 Qg4+ 25.Ke5 Qxg3+
                       26.Bf4 Re8+ 27.Kd4 Qxf4 28.Qxf5+ Qxf5 (2.250.023) 445

14/39  0:08   +0.76++  17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 Qh5+
                       23.Kf4 f5 24.Qc5 Qg4+ 25.Ke5 Qxg3+
                       26.Kxf5 Qh3+ 27.Kf4 Qf1+ 28.Kg5 Qf6+
                       29.Kg4 (3.930.229) 451

14/43  0:11   +0.76    17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 Qh5+
                       23.Kf2 Qd1 24.Qd3 Rh2+ 25.Ke3 Qg1+
                       26.Kf4 Qf2+ 27.Kg4 g6 28.c3 Qxg3+
                       29.Qxg3 (5.265.622) 445

15/45  0:21   +0.51--  17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 Qh5+
                       23.Kf2 Qd1 24.Qd3 Rh2+ 25.Ke3 Qg1+
                       26.Kf4 Qf2+ 27.Kg4 g6 28.c3 Qxg3+
                       29.Qxg3 Rh4+ 30.Kxh4 (9.098.540) 433

15/45  0:28   +0.32    17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 Qh5+
                       23.Kf2 Qd1 24.Qd3 Rh2+ 25.Ke3 Qg1+
                       26.Kf4 Qf2+ 27.Kg4 g6 28.Qf3 Qd4 (12.525.363) 442

16/47  0:56   +0.35    17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 f5
                       23.Bb2 Qxc2 24.Bxg7 Rh2 25.Re1 Qxe4+
                       26.Qxe4 Kb8 27.Qxf5 Rf2+ 28.Kxf2 (24.864.984) 440

17/41  1:13   +0.60++  17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 f5
                       23.Bb2 Qxc2 24.Bxg7 Re8 25.Re1 fxe4+
                       26.Kf4 Qxa2 27.Qxe4 Rxe4+ 28.Kxe4 (32.837.415) 444

17/48  1:30   +0.60    17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Kf2 Qh2+ 22.Kf3 f5
                       23.Bb2 Qxc2 24.Bxg7 Re8 25.Rb2 fxe4+
                       26.Kf4 Qd1 27.a4 Qd6+ 28.Kg5 Qg6+
                       29.Kxg6 (40.400.560) 446

18/51  2:53   +0.35--  17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Qf3 Qh2+ 22.Kf1 Qxc2
                       23.Ra1 Kb8 24.Bf4 Rh2 25.Rd1 Qc4+
                       26.Kg1 Qc1 27.Bxc1 Rxa2 28.Qxf7 Rg2+ (78.750.348) 453

18/51  3:49   +0.13    17...hxg4 18.Re3 g3 19.fxg3 Bxe3+
                       20.Qxe3 Qxh3 21.Qf3 Qh2+ 22.Kf1 Qxc2
                       23.Ra1 Qc4+ 24.Kg2 Qxb4 25.Qe2 Qd4
                       26.Bb2 Qd7 27.Bxg7 Qh3+ 28.Kf2 Qh2+
                       29.Kf3 Qh5+ 30.Ke3 Qg5+ (104.584.578) 454

19/51  6:09   +0.27    17...hxg4 18.Re3 g3 19.fxg3 Qxg3+
                       20.Kf1 Bxe3 21.Qxe3 Qh2 22.Rb3 Rh6
                       23.Qg5 Rg6 24.Qf5+ Kb8 25.Bg5 Qxc2
                       26.Rf3 Qxa2 27.Qc5 Rd6 28.Bf4 Rd1+ (166.829.351) 451

best move: h5xg4 time: 6:12.265 min  n/s: 450.963  CPU 98.0%   n/s(1CPU):
460.166  nodes: 167.864.231

I stopped here because this is allready 3 times longer than you original time
control.

Bye
Ingo

>>[Event "Blitz:2'"]
>>[Site "MyTown"]
>>[Date "2004.09.17"]
>>[Round "?"]
>>[White "Pierre"]
>>[Black "Vin"]
>>[Result "*"]
>>[PlyCount "41"]
>>
>>1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Bg4 6. d3 h5 7. Nbd2 Qf6 8.
>>Re1 Bc5 9. Rb1 Ne7 10. b4 Bb6 11. h3 Ng6 12. d4 O-O-O 13. dxe5 Nxe5 14. Qe2
>>Rxd2 15. Qxd2 Nxf3+ 16. gxf3 Qh4 17. fxg4 hxg4 18. Re3 g3 19. fxg3 Bxe3+ 20.
>>Qxe3 Qxh3 21. Kf2 *



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