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

Author: Mike S.

Date: 22:01:32 11/22/02

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 (?!).

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

Re: Why do engines blunder here, playing 37.h5?? Gian-Carlo Pascutto 03:46:39 11/23/02
Re: Why do engines blunder here, playing 37.h5?? [A simple answer] Kurt Utzinger 03:15:09 11/23/02
Re: Why do engines blunder here, playing 37.h5?? Ulrich Tuerke 03:08:31 11/23/02
Re: Why do engines blunder here, playing 37.h5?? Ernst Walet 01:08:52 11/23/02
Hiarcs 8.0 chooses wisely. Timothy J. Frohlick 23:45:03 11/22/02
Re: Why do engines blunder here, playing 37.h5?? Martin Giepmans 22:57:43 11/22/02

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