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Subject: Re: BELCT 2001 discussion of the game zarkov-yace

Author: Dieter Buerssner

Date: 07:11:41 10/06/01

Go up one level in this thread


On October 05, 2001 at 15:53:32, Uri Blass wrote:

[Rearanged and snipped]

>Zarkov4.5T - Yace
>[D]1nr1rbk1/qp3ppp/4b3/pQ1pPpB1/N2P4/P1R2N2/1P3PPP/4R1K1 b - - 0 1

>I think that yace blundered by 20...Bd7

I thought about this as well. Here in few moves the score dropped by about 1.5
pawns in few moves (pawn=0.8 in Yace). However, it seems that after 21. Qxd5,
21...h6 was even worse. When I analyse the game from back to front (for about
one minute each move), after 21...h6 I get (German notation, S->N, L->B, T->R,
D->Q):

 11.01	 1:01 	+1.41 	22.Txc8 Lxc8 23.Ld2 Ld7 24.Db3 b5 25.Sc3 b4 26.axb4 axb4
27.Sd5 Sc6 28.Dc4 Tc8 29.Le3 (9.191.711) 148.7

After 21...Bc6 I get similar scores, than you showed for Fritz.

>Here is Deep Fritz's analysis
>Deep Fritz needs some hours on p800 to avoid 20...Bd7

Then Yace is at least in good company (also after reading Ernst's post) ...
After 21...h6 I get the following:

  9.01	 0:15 	+0.44 	21.Ld2 Txc3 22.Sxc3 Td8 23.Tc1 Sc6 24.Se2 Tc8 25.b4 axb4
(1.892.588) 122.6
  9.03	 0:20 	+0.45++ 	21.Txc8 Txc8 22.Ld2 Ld7 23.Db6 Sc6 24.Dxa7 Lxa3
(2.498.144) 124.7
  9.03	 0:21 	+0.54 	21.Txc8 Txc8 22.Ld2 Sc6 23.Sb6 Td8 24.Tc1 Le7 25.b4 a4
(2.713.248) 124.0
  9.54	 0:27 	+0.54 	21.Txc8 Txc8 22.Ld2 Sc6 23.Sb6 Td8 24.Tc1 Le7 25.b4 a4
(3.502.052) 125.2
 10.01	 0:40 	+0.67 	21.Txc8 Txc8 22.Sb6 hxg5 23.Sxc8 Lxc8 24.Sxg5 b6 25.Dxd5
Dd7 26.Dc4 Lb7 (5.003.418) 125.0
 10.54	 0:54 	+0.67 	21.Txc8 Txc8 22.Sb6 hxg5 23.Sxc8 Lxc8 24.Sxg5 b6 25.Dxd5
Dd7 26.Dc4 Lb7 (6.898.065) 126.8
 11.01	 1:07 	+0.67 	21.Txc8 Txc8 22.Sb6 hxg5 23.Sxc8 Lxc8 24.Sxg5 b6 25.Dxd5
De7 26.Dc4 Lb7 27.Sf3 Lxf3 (8.703.943) 128.1
 11.54	 1:41 	+0.67 	21.Txc8 Txc8 22.Sb6 hxg5 23.Sxc8 Lxc8 24.Sxg5 b6 25.Dxd5
De7 26.Dc4 Lb7 27.Sf3 Lxf3 (13.563.372) 133.0
 12.01	 3:29 	+0.52 	21.Txc8 Txc8 22.Ld2 Ld7 23.Db6 Da6 24.Dxa6 bxa6 25.Sb6 Tc2
26.Tb1 Le6 27.Lxa5 Sc6 (27.052.046) 129.0
 12.02	 4:43 	+0.53++ 	21.Ld2 Txc3 22.Lxc3 Sc6 23.Sb6 Da6 24.Dxa6 bxa6 25.Tc1
Tb8 26.Sa4 Le7 27.Sc5 f4 (35.599.897) 125.3
 12.02	 5:35 	+0.54 	21.Ld2 Txc3 22.Lxc3 Sc6 23.Sb6 Da6 24.Dxa6 bxa6 25.Tc1 Tb8
26.Sa4 Tb5 (41.533.410) 123.9
 12.54	 8:23 	+0.54 	21.Ld2 Txc3 22.Lxc3 Sc6 23.Sb6 Da6 24.Dxa6 bxa6 25.Tc1 Tb8
26.Sa4 Tb5 (63.050.673) 125.1
 13.01	11:59 	+0.50 	21.Ld2 Txc3 22.Lxc3 Sc6 23.Sb6 Td8 24.Tc1 Le7 25.b3 f6
26.exf6 Lxf6 27.Te1 Lf7 28.a4 (89.295.123) 124.0
 13.02	13:10 	+0.51++ 	21.Txc8 Txc8 22.Ld2 Ld7 23.Db6 Da6 24.Dxa6 bxa6 25.Sb6
Tc2 26.Tb1 Le6 27.Lxa5 Ld6 (98.011.398) 124.0
 13.02	16:16 	+0.52 	21.Txc8 Txc8 22.Ld2 Ld7 23.Db6 (120.829.623) 123.7
 13.54	25:12 	+0.52 	21.Txc8 Txc8 22.Ld2 Ld7 23.Db6 (189.580.066) 125.3
 14.01	35:33 	+0.52 	21.Txc8 Txc8 22.Ld2 Sc6 23.Sb6 Tb8 24.Tc1 g5 25.Lc3 Da6
26.Db3 Sb4 27.Sa4 Sd3 (266.284.994) 124.7
 14.54	56:31 	+0.52 	21.Txc8 Txc8 22.Ld2 Sc6 23.Sb6 Tb8 24.Tc1 g5 25.Lc3 Da6
26.Db3 Sb4 27.Sa4 Sd3 (430.776.766) 127.0
 15.01	82:01 	+0.51 	21.Txc8 Txc8 22.Ld2 Sc6 23.Sb6 Tb8 24.Tc1 g5 25.Sxd5 Lxd5
26.Dxd5 g4 27.Sh4 Td8 28.Db5 Txd4 29.Le3 (613.901.494) 124.7
 15.54	148:18 	+0.51 	21.Txc8 Txc8 22.Ld2 Sc6 23.Sb6 Tb8 24.Tc1 g5 25.Sxd5 Lxd5
26.Dxd5 g4 27.Sh4 Td8 28.Db5 Txd4 29.Le3 (1.121.208.459) 125.9
 16.01	226:42 	+0.39 	21.Txc8 Txc8 22.Ld2 Sc6 23.Sb6 Tb8 24.Tc1 g5 25.Lc3 Da6
26.Db3 Sb4 27.Sa4 Sd3 (1.658.039.763) 121.8
 16.02	294:38 	+0.40++ 	21.Ld2 Txc3 22.Sxc3 Td8 23.Tc1 Da6 24.Dxa6 bxa6
(2.091.868.565) 118.3
 16.02	362:40 	+0.41 	21.Ld2 Txc3 22.Sxc3 Td8 23.Tc1 Sc6 24.Se2 f6 25.exf6
(2.535.344.699) 116.5
 16.42	525:30 	+0.41 	21.Ld2 Txc3 22.Sxc3 Td8 23.Tc1 Sc6 24.Se2 f6 25.exf6
(3.601.191.337) 114.2

It seem not easy. From the programmer point of view, I cannot think of much what
to do here. Perhaps, like I user once suggested "you must reach more depth".
Well, if that's all :-)

>I suspect that only material evaluation can find that 20...Bd7 is losing a pawn
>when 20...h6 and it may be interesting to see if I am right.

I cannot understand. You mean that h6 does not lose material? I tried for 10
minutes, and there could be seen no loss of material for both moves.

Regards,
Dieter

The actual game with scores from black's point of view:

[Event "1 BelCT2001"]
[Site "Berlin"]
[Date "2001.10.03"]
[Round "7"]
[White "Zarkov 4.5T"]
[Black "YACE 0.99.56"]
[Result "1-0"]

1. e4 {0s} e6 {book 0s} 2. d4 {7s} d5 {book 0s} 3. e5 {6s}
c5 {book 0s} 4. c3 {10s} Qb6 {book 0s} 5. Nf3 {12s} Bd7
{book 0s} 6. a3 {9s} a5 {book 0s} 7. Bd3 {3:40m} Nc6 {book
0s} 8. Bc2 {3:17m} Nh6 {book 0s} 9. O-O {3:55m} cxd4 {book
0s} 10. cxd4 {1:40m} Nf5 {book 0s} 11. Bxf5 {3:46m} exf5
{book 0s} 12. Nc3 {3:18m} Be6 {book 0s} 13. Na4 {2:22m} Qa7
{book 0s} 14. Be3 {2:42m} Be7 {book 0s} 15. Rc1 {3:05m} Rc8
{book 0s} 16. Qd3 {4:48m} O-O {-0.59/13 8:34m} 17. Rfe1
{13s (Rc3)} Rfe8 {-0.43/12 3:53m} 18. Rc3 {3:56m} Nb8
{-0.45/13 59s} 19. Bg5 {3:07m (Qb5)} Bf8 {-0.32/13 4:04m}
20. Qb5 {13s} Bd7 {-0.30/13 3:55m} 21. Qxd5 {23s (Qb3)} h6
{-0.56/12 2:26m} 22. Rxc8 {3:40m} Rxc8 {-0.68/13 27s}
23. e6 {1:51m} fxe6 {-0.95/13 2:28m} 24. Rxe6 {41s} Kh8
{-0.89/12 1:39m} 25. Nc3 {1:42m (Qe5)} b5 {-1.64/12 7:35m}
26. Rg6 {16s} Bc6 {-1.55/11 1:48m} 27. Qe5 {1:10m} Qd7
{-1.70/11 1:09m} 28. Rxh6+ {3:05m} Kg8 {-1.79/12 0s}
29. Rxc6 {3:17m} Qxc6 {-1.73/12 1:28m} 30. Qxf5 {2:01m} b4
{-1.67/12 1:09m} 31. Ne5 {2:36m} Qe8 {-1.68/12 2:44m}
32. axb4 {12s} Nc6 {-1.51/12 3:55m} 33. bxa5 {3:13m (Nf3)}
Nxd4 {-1.26/14 5:31m} 34. Qe4 {13s} Rc5 {-1.22/13 3:29m}
35. Bf4 {10s} Ne6 {-1.21/13 4:45m} 36. Ng4 {12s (Nd3)} Rxa5
{-1.19/13 3:33m} 37. h3 {10s} Qf7 {-1.04/12 2:10m} 38. Be5
{3:22m} Bc5 {-1.07/11 38s} 39. Qe2 {1:40m (Bg3)} Qf5
{-1.10/11 3:44m} 40. Qd2 {13s (Qe1)} Ra8 {-1.09/11 4:02m}
41. Qe1 {2:28m (Kh2)} Qc2 {-1.06/9 31s} 42. Bd6 {2:02m
(Nd5)} Qb3 {-0.98/11 49s} 43. Bxc5 {1:51m} Nxc5 {-0.97/11
0s} 44. Qe3 {2:23m (Qe2)} Nb7 {-0.99/11 59s} 45. Qd2 {2:06m
(Qe2)} Rd8 {-1.12/11 57s} 46. Qe2 {54s} Nc5 {-1.09/11 1s}
47. Qe5 {2:33m} Nd3 {-1.20/11 0s} 48. Qg5 {1:31m} Ra8
{-1.45/11 0s} 49. Nf6+ {1:43m} Kf8 {-3.67/12 2:52m}
50. Nd7+ {18s (Nfd5)} Kf7 {-3.17/11 4:06m} 51. Qf5+ {2:04m}
Ke8 {-3.01/10 0s} 52. Nd5 {2:31m (Qf8+)} Ra1+ {-3.13/10
1:45m} 53. Kh2 {9s} Re1 {-4.59/11 2:55m} 54. N7b6 {12s}
Qxb2 {-5.72/10 2:21m} 55. Qg6+ {1:55m} Kd8 {-5.72/10 0s}
56. Qc6 {1:14m} Rh1+ {-6.05/13 0s} 57. Kxh1 {49s} Qc1+
{-6.17/15 0s} 58. Qxc1 {1:10m} Nxc1 {-6.20/16 0s} 59. g4
{1:27m (f4)} Ke8 {-6.29/14 25s} 60. f4 {1:30m} Nd3
{-6.55/16 0s} 61. f5 {1:17m} Nc5 {-6.65/15 0s} 62. Kg2
{1:33m (h4)} Nb3 {-7.00/14 24s} 63. Kf3 {1:27m} Nd4+
{-7.18/15 0s} 64. Kf4 {1:35m (Ke4)} Kf7 {-7.21/13 20s}
65. h4 {1:17m (g5)} Nb3 {-7.25/13 16s} 66. Nd7 {1:32m (g5)}
Ke8 {-7.83/12 11s} 67. Ne5 {1:30m (h5)} Nd4 {-8.28/12 22s}
68. h5 {1s} Kf8 {-14.66/13 58s} 69. g5 {7s (Kg5)} Ne2+
{-18.33/13 1:41m} 70. Kg4 {1:07m} Nc3 {-20.63/14 40s}
71. Nxc3 {26s} 1-0




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