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Subject: Re: BUG in FRITZ 8.0023 ! A real possible Testposition

Author: Eduard Nemeth

Date: 05:15:10 03/07/03

Go up one level in this thread


On March 07, 2003 at 06:46:33, Mike Hood wrote:

>On March 07, 2003 at 01:28:43, Drexel,Michael wrote:
>
>>On March 06, 2003 at 22:58:42, Eduard Nemeth wrote:
>>
>>>First moves are: 1.e4 Nf6 2.Bc4 c6 3.a3
>>>
>>>[D]rnbqkb1r/pp1ppppp/2p2n2/8/2B1P3/P7/1PPP1PPP/RNBQK1NR b KQkq - 0 1
>>>
>>>Fritz 8.0023 played now nit Nxe4. :(
>>>
>>>Fritz 8.005 does it! :)
>>>
>>>My full german message read here:
>>>
>>>http://f50.parsimony.net/forum202029/messages/28.htm
>>>
>>>Eduard
>>
>>
>>So what?? He searched 24 hours to find a bug and then he came up with this??
>>
>>Fritz 8.0.0.23 would play 3...d5 with big advantage already. After 3 moves with
>>the black pieces.
>>That is exactly what I want to see.
>>Its just silly to allow any complications if there is a safe way to get the full
>>point.
>>
>>Btw, Fritz 8 would never play 2...c6 and this move is also not in the Fritz8.ctg
>>tree.
>>
>>No chessplayer (except Eduard) would like to analyse such crap (3.a3??).
>
>Hey! Why do you say that? When testing a chess engine (it's really a matter for
>beta tests, not post-release tests) all moves have to be analysed, not just the
>"sensible" moves. And when using a chess engine, everyone uses it in different
>ways. Despite having powerhouses like Fritz and Shredder on my PC, I still play
>most of my games against Goliath Light. I used to use Fritz to analyse my club
>games, but I've discovered that since version 7 Shredder is a better choice. All
>I'm saying is that everyone uses his chess engine(s) of choice in different
>ways.
>
>Personally, I'm very thankful to Eduard for his work in testing new engines. He
>does a great job, and Chessbase ought to send him a beta copy of their new
>engines before release :)

Thanks! :)

Here a real possible Analyses Position:

This is a real possibile position to analyses:

1.e4 e5 2.d4 exd4 3.Bc4 Nf6 4.c3 Line



[D]rnbqkb1r/pppp1ppp/5n2/8/2BpP3/2P5/PP3PPP/RNBQK1NR b KQkq - 0 1

Analysis by Fritz 7.008:

1. ³ (-0.66): 4...De7 5.Se2 Dxe4 6.Dxd4 Dxd4 7.Sxd4 d5 8.Lb5+ Ld7 9.Lf4 c5
10.Lxd7+
2. ³ (-0.63): 4...Sc6 5.Ld5 Lc5 6.Sf3 Se7 7.cxd4 Lb4+ 8.Ld2 Lxd2+ 9.Sbxd2 Sexd5
10.exd5 0-0
3. ³ (-0.50): 4...Sxe4 5.Lxf7+ Kxf7 6.Dh5+ g6 7.Dd5+ Kg7 8.Dxe4 Sc6 9.cxd4 Lb4+
10.Sd2 Te8
4. ³ (-0.31): 4...d6 5.Dxd4 Sc6 6.De3 Se5 7.Le2 Le6 8.Sd2 Le7
5. ³ (-0.31): 4...dxc3 5.Sxc3 Sc6 6.Sf3 Lc5 7.0-0 d6 8.Lg5 h6 9.Lxf6 Dxf6 10.Sd5
6. = (-0.13): 4...d5 5.exd5 dxc3 6.Sxc3 Le7 7.Sf3 0-0 8.0-0 Te8
7. = (-0.09): 4...c5 5.De2 d5 6.exd5+ Le7 7.cxd4 cxd4 8.Sf3 Lg4 9.h3 Lxf3
10.Dxf3 Ld6
8. = (-0.06): 4...a6 5.De2 d5 6.exd5+ Le7 7.Sf3 0-0 8.Sxd4 Te8 9.Df3
9. = (0.03): 4...b5 5.Lxb5 Sxe4 6.Sf3 De7 7.0-0 c6 8.Ld3 dxc3 9.Sxc3
10. = (0.00): 4...c6


rnbqkb1r/pppp1ppp/5n2/8/2BpP3/2P5/PP3PPP/RNBQK1NR b KQkq - 0 1

Analysis by Fritz 8.0023:

1. ³ (-0.69): 4...Sc6 5.Ld5 Lc5 6.Sf3 Se7 7.0-0 Sexd5 8.cxd4 Le7 9.exd5 Sxd5
2. ³ (-0.38): 4...d6 5.Dxd4 Sc6 6.De3 Se5 7.Lb3 Dd7 8.Se2 Dg4 9.La4+
3. = (-0.13): 4...dxc3 5.Sxc3 Sc6 6.Sf3 Lb4 7.0-0 d6 8.Lg5 h6 9.Lxf6
4. = (-0.13): 4...d5 5.exd5 Sxd5 6.Dxd4 De7+ 7.Se2 Sb6 8.Ld3 Sc6 9.De3 Sd5
10.Dxe7+
5. = (-0.13): 4...c6 5.Dxd4 De7 6.Ld3 d5 7.e5 Sbd7 8.Sf3 Sc5 9.0-0
6. = (-0.09): 4...c5 5.De2 d6 6.Sf3 Sc6 7.cxd4 Lg4 8.Lb5 a6 9.Lxc6+ bxc6 10.dxc5
Da5+
7. = (-0.06): 4...a6 5.Sf3 Sxe4 6.Dxd4 Sd6 7.0-0 Sxc4 8.Te1+ Le7
8. = (-0.03): 4...Ld6 5.Sf3 Sc6 6.Sxd4 Sxd4 7.Dxd4 De7 8.Sd2 Le5 9.Dd3 0-0
9. = (0.00): 4...b5 5.Lxb5 Sxe4 6.Sf3 Sd6 7.Sxd4 De7+ 8.Le2 c5 9.Sf3 Lb7
10. = (0.03): 4...h6 5.Sf3 Sc6 6.e5 d5 7.Ld3 De7 8.De2 Se4 9.cxd4

Nxe4 not find.

After Nxe4:


[D]rnbqkb1r/pppp1ppp/8/8/2Bpn3/2P5/PP3PPP/RNBQK1NR w KQkq - 0 1

Analysis by Fritz 8.0023:

1. µ (-0.78): 5.Dxd4 De7 6.Se2 Sc6 7.De3 Sf6 8.0-0 Se5
2. µ (-0.84): 5.Sf3 Sc6 6.0-0 d5 7.Lb5 a6 8.Lxc6+ bxc6 9.Da4 Df6 10.cxd4
3. µ (-1.00): 5.Lxf7+ Kxf7 6.Dh5+ g6 7.Dd5+ Kg7 8.Dxe4 Sc6 9.Dd3 Df6 10.Se2 Lc5
4. µ (-1.00): 5.Se2 d5 6.Dxd4 Le6 7.Lb5+ c6 8.Ld3 Sd7 9.0-0 Sdc5 10.Lc2
5. µ (-1.22): 5.Ld3 d5 6.Sf3 dxc3 7.Sxc3 Sxc3 8.bxc3 Lc5 9.0-0 0-0 10.Te1 Te8
6. µ (-1.25): 5.De2 d5 6.Sf3 Le7 7.cxd4 0-0 8.0-0 dxc4
7. µ (-1.19): 5.Ld5 Sf6 6.Dxd4 Sc6 7.Lxc6 dxc6 8.Dxd8+ Kxd8 9.Lg5 Ld6 10.Lxf6+
gxf6
8. µ (-1.22): 5.Dh5 De7 6.Se2 Sc6 7.cxd4 Sxd4 8.Lxf7+ Dxf7 9.De5+ De7 10.Dxd4
9. µ (-1.28): 5.Dd3 d5 6.Dxd4 Le6 7.Sf3 Sc6 8.Lb5 Dd7
10. µ (-1.31): 5.a3 d5 6.Dxd4 Le6 7.Sf3 Sc6 8.Lb5 Dd7

Why does Fritz 8.0023 not play Nxe4?

Eduard




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