Author: Kurt Utzinger
Date: 06:06:52 05/21/04
Go up one level in this thread
On May 21, 2004 at 08:22:56, Will Hunter wrote:
>On May 21, 2004 at 07:50:11, Kurt Utzinger wrote:
>
>>[D]r1b1k2r/pp1n1p1p/5p2/qB2p3/3NP2P/7R/P4PP1/R2Q1K2 w kq - 0 15
>>Shredder 8 vs Ruffian 2.1.0
>>Position after 14...e5 15.Nf5!! +-
>>Which programs find this fine winning move?
>>
>>[Event "RK 2004 Ath 1.3/64 90m+30s"]
>>[Site "Zurich"]
>>[Date "2004.05.18"]
>>[Round "16.5"]
>>[White "Shredder 8"]
>>[Black "Ruffian 2.1.0"]
>>[Result "1-0"]
>>[ECO "D39"]
>>[Annotator "Utzinger,K"]
>>[PlyCount "51"]
>>
>>1. d4 Nf6 2. Nf3 d5 3. c4 e6 4. Nc3 dxc4 5. e4 Bb4 6. Bg5 c5 7. Bxc4 cxd4 8.
>>Nxd4 Bxc3+ 9. bxc3 Qa5 10. Bb5+ Nbd7 11. Bxf6 Qxc3+ 12. Kf1 {The opening line
>>chosen by the programs is a very critical one for Black with a bad score - The
>>gewahelte Eroeffnungsvariante is insbesondere fuer Schwarz sehr kritisch mit
>>einem schlechten Score} gxf6 {Black last book move} 13. h4 Qa5 14. Rh3 {
>>White last book move} e5 {Not only for computers a logical move as it seems
>>as if White is forced to play 15.Bxd7 but in reality it's completely wrong to
>>give square free for white's knight. Necessary was 14...a6 - Nicht nur fuer
>>Computer eine logische Fortsetzung, denn scheinbar ist 15.Lxd7 erzwungen.
>>Trotzdem war es voellig falsch, das Feld f5 fuer den weissen Springer
>>freizumachen. Notwendig war 14...a6} 15. Nf5 {
>>A very fine piece sacrifice - Ein sehr huebsches Figurenopfer} Qxb5+ 16. Rd3 {
>>With the threat Nd6 winning black's queen - Mit der Drohung, durch Sd6 die
>>schwarze Dame zugewinnen} Qa6 17. Kg1 {I think it's no exaggaration to say
>>that White has already reached a won position - Ich glaube, dass man ohne zu
>>uebertreiben sagen kann, dass Weiss eine gewonnene Stellung erreicht hat} Rg8
>>18. Rc1 {Despite long analysis I could not find a way for Black to save the
>>game - Trotz langer Analysen konnte ich fuer Schwarz keine Verteidigung mehr
>>finden, um die Partie zu retten} Qxa2 19. Rc7 Qe6 20. Qc2 {
>>Wins material - Gewinnt Material} Kd8 21. Nd6 Qxd6 {
>>21...Qg4 does not work on account of 22.Rg3 - 21...Dg4 scheitert an 22.Tg3} 22.
>>Rxd6 Re8 23. Rd3 Re6 24. Rg3 Re8 25. Qc4 Rb8 26. Rc3 {A good example to
>>demonstrate that one wrong move often is decisive - Ein gutes Beispiel, dass
>>ein einziger falscher Zug genuegt, die Entscheidung zu bringen} 1-0
>
>Yes, this is odd Shredder 8 would allow, worse, force 15. Nf5!! as it's
>devastating!
>
>This is a relatively fast game, but by no means blitz, and computer processing
>speed isn't a factor either. It's puzzling.
>
>Curious, would you reverse engines in this position to see the result?
>
>Maybe this could be attributed to a bug in Shredder 8?
>
>I think SMK should see this.
Shredder8, the great winner of this game, would not play
6...c5 as this move has a question mark in its opening
book and furthermore would also not choose 14...e5? from
the book if the book option is set to optimal. But even
in analysis, Shredder8 would prefer the much better 14...a6
Shredder 8 - Ruffian 2.1.0 (P4 1.8/32 MB hash)
r1b1k2r/pp1n1p1p/4pp2/qB6/3NP2P/7R/P4PP1/R2Q1K2 b kq - 0 1
Analysis by Shredder 8:
14...0-0 15.Qb1 Kh8
² (0.35) Depth: 1/1 00:00:00
² (0.31) Depth: 2/6 00:00:00
14...Rg8 15.Rd3 a6 16.Ba4
= (0.02) Depth: 2/6 00:00:00
= (0.02) Depth: 2/6 00:00:00
14...e5 15.Qh5 Qb6 16.Rf3 exd4 17.Bxd7+ Kxd7 18.Qxf7+ Kd8 19.Qxf6+ Qxf6
= (-0.13) Depth: 2/6 00:00:00
= (-0.13) Depth: 2/11 00:00:00
14...a6 15.Be2 0-0 16.Rg3+ Kh8
= (-0.15) Depth: 2/11 00:00:00
³ (-0.37) Depth: 4/10 00:00:00
14...e5 15.Nf5 Qxb5+ 16.Rd3 Qa6 17.Nd6+ Ke7 18.Qb3 Rf8 19.Nf5+ Kd8 20.Rad1 Qe6
21.Rd5 Rg8 22.Qc3
³ (-0.38) Depth: 4/14 00:00:00
³ (-0.32) Depth: 11/35 00:00:03 860kN
14...a6 15.Be2 Qe5 16.Rc1 Qxe4 17.Bf3 Qf4 18.Ne2 Qb4 19.Rc7 Qa5 20.Bxb7 Qxc7
21.Bxa8
³ (-0.33) Depth: 11/35 00:00:06 1440kN
= (-0.19) Depth: 18/47 00:08:26 120296kN
(Utzinger, MyTown 21.05.2004)
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