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Subject: Re: Why do engines blunder here, playing 37.h5??

Author: Ulrich Tuerke

Date: 03:08:31 11/23/02

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On November 23, 2002 at 01:01:32, Mike S. wrote:

>From a game Shredder 5.32 - Ruffian 1.0.1, 40/1h P3/700:
>
>[D]5k2/pp2r2p/2p2qp1/2Pn1p2/PPN1p2P/3rP3/5PP1/1QR1R1K1 w - - 0 1
>
>Analysis by Shredder 5.32:
>
>37.Dxd3 exd3
>  -+  (-4.29)   Tiefe: 1/2   00:00:00
>37.h5 gxh5 38.b5 h4 39.bxc6 Dxc6 40.Db2 Df6 41.Dxf6+ Sxf6 42.Sd6 Td5
>  =  (0.11)   Tiefe: 1/2   00:00:00
>  =  (-0.12)  Tiefe: 15/30   00:31:54  508626kN
>
>Analysis by Chess Tiger 14.0:
>
>37.h5 Tc7
>  ³  (-0.64)   Tiefe: 8   00:00:00  138kN
>  ³  (-0.45)   Tiefe: 15  00:10:29  212301kN
>
>Analysis by Fritz 7:
>
>37.h5 gxh5 38.b5 cxb5 39.axb5 Tg7 40.b6 axb6 41.Sxb6 Dg6 42.g3 h4 43.Sxd5
>  ³  (-0.56)   Tiefe: 7/23    00:00:00  160kN
>  µ  (-0.78)   Tiefe: 10/31   00:00:06  3467kN
>37.Ted1 Txd1+ 38.Txd1 Dxh4 39.b5 f4 40.exf4 Dxf4 41.Db2 Kg8 42.Sd6 Dg4 43.Dd4
>Dh4
>  µ  (-0.75)   Tiefe: 10/31   00:00:06  3789kN
>  ³  (-0.53)   Tiefe: 12/33   00:00:16  10341kN
>37.h5 gxh5 38.b5 Tg7 39.Db2 Dg5 40.g3 h4 41.De5 Sc7 42.b6 axb6 43.cxb6
>  ³  (-0.50)   Tiefe: 12/34   00:00:32  20236kN
>  µ  (-1.09)   Tiefe: 15/43   00:16:11  611858kN
>
>Why do many engines waste the h-pawn here, with no obvious reason? Weakening f5
>has no perspective; as it turns out Nc4-d6 can't harm Black. The open g-file is
>much to Black's favour.
>
>Usually I don't see this type of blunder from top engines. Is there something
>"computer-specific" which causes 37.h5?? here? The normal move is 37.g3, which
>certainly isn't worse than opening an attack file against the own king (?!).

Yes, peculiar they like g5.
Comet doesn't consider it at all:


New position
5k2/pp2r2p/2p2qp1/2Pn1p2/PPN1p2P/3rP3/5PP1/1QR1R1K1 w - - 0 1

Analysis by Comet B54:

...
1.g3 Nc3 2.Qc2 Rg7
  µ  (-0.72)   Depth: 5/21   00:00:00  20kN
1.g3 Nc3 2.Qc2 Red7 3.Nd6 Kg7
  ³  (-0.56)   Depth: 5/21   00:00:00  29kN
1.g3 Rd7 2.Nd6 Rd2 3.Qb3 Rb2
  ³  (-0.57)   Depth: 6/21   00:00:00  45kN
1.g3 Rd7 2.Nd6 Rd2 3.Qb3 Kg7
  µ  (-0.77)   Depth: 6/21   00:00:00  99kN
1.g3 Rd7
  µ  (-0.77)   Depth: 7/21   00:00:00  189kN
1.g3 Rd7 2.Nd6 b6 3.Rc4 Nc3 4.Qc2
  ³  (-0.52)   Depth: 7/22   00:00:00  296kN
1.g3 Rd7 2.Nd6 b6 3.cxb6 axb6 4.h5
  ³  (-0.53)   Depth: 8/22   00:00:01  387kN
1.g3 Kg7 2.Nd6 Ra3 3.a5 Ra4 4.Rc4 b5
  ³  (-0.67)   Depth: 8/26   00:00:02  1109kN
1.g3 Kg7 2.Nd6 Ra3 3.a5 Rb3 4.Qxb3 Qxd6
  ³  (-0.67)   Depth: 9/29   00:00:04  1707kN
1.g3 Kg7 2.Kg2 h6 3.Nd6 Rd2 4.Nc4 Nc3 5.Qa1 Rd3
  ³  (-0.46)   Depth: 9/29   00:00:08  3463kN
1.g3
  ³  (-0.47)   Depth: 10/29   00:00:09  3900kN
1.g3 Kg7 2.Kg2 h6 3.Nd6 Ra3 4.a5 Ra4 5.Rc4 Rd7
  ³  (-0.52)   Depth: 10/34   00:00:30  12956kN
1.g3 Rd7 2.Nd6 Qg7 3.h5 Qh6 4.hxg6 hxg6 5.Red1 Rxd1+ 6.Kg2
  ³  (-0.53)   Depth: 11/38   00:00:48  21527kN
1.g3 f4 2.gxf4 Qxh4 3.Qb2 Nf6 4.Ne5 Rd5 5.f3 exf3 6.Nxf3
  µ  (-0.74)   Depth: 11/39   00:02:02  57742kN

(Tuerke, MyTown 23.11.2002)


Uli

>
>Thanks,
>M.Scheidl
>
>
>P.S. the game:
>
>[Site "40/1h P3/700"]
>[Date "2002.11.14"]
>[Round "1.5"]
>[White "Shredder 5.32"]
>[Black "Ruffian 1.0.1"]
>[Result "0-1"]
>[ECO "A21"]
>[PlyCount "84"]
>
>1. c4 e5 2. Nc3 c6 3. Nf3 Qc7 4. d4 d6 5. e3 Be7 6. Bd3 Nf6 7. O-O O-O 8. h3
>Na6 9. a3 Bd7 10. Qc2 Rfe8 11. b4 Rad8 12. dxe5 dxe5 13. Ne4 g6 14. Bb2 Nxe4
>15. Bxe4 Bf8 16. Rad1 Bg7 17. Qb3 Be6 18. Ng5 Bc8 19. Bb1 Qe7 20. Nf3 e4 21.
>Nd2 f5 22. Bxg7 Qxg7 23. c5+ Be6 24. Nc4 Nc7 25. Qc2 Nb5 26. Ba2 Qc3 27. Qe2
>Rd3 28. Rc1 Qg7 29. Na5 Bxa2 30. Qxa2+ Kf8 31. Nc4 Re7 32. h4 Red7 33. a4 Nc3
>34. Qc2 Nd5 35. Qb1 Qf6 36. Rfe1 Re7 37. h5 gxh5 38. Nd6 Rg7 39. Nc4 f4 40. Qb2
>Qg5 41. f3 fxe3 42. f4 Nxf4 0-1



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