Author: David Rasmussen
Date: 03:03:14 01/19/03
Go up one level in this thread
On January 18, 2003 at 22:16:15, John Merlino wrote:
>
>Some brief analysis with Chessmaster 9000 seems to say that 54.Bg1 may have been
>the move that started the downfall. CM9000 prefers g4 with an eval of exactly
>zero.
>
>After that things go downhill pretty quickly. Even though CM agrees with all of
>the moves after that, by move 61, the eval is already about -1.5. Any "errors"
>after that are probably not as important....
>
>jm
Thank you very much, John, for taking the time to do this! I will look into it
later.
[D]3b4/8/3k4/p2Pp1p1/2P5/pKP1B1P1/Nn6/8 w - - 0 54
What could be the missing knowledge that makes Chezzz play Bg1 and avoid g4? And
is g4 _necesary_ or is Bg1 specifically an _error_?
One think I can think of that Chezzz lacks, is that it would be a good idea to
fixate the g5 pawn on a dark square, because black's bishop is restrained and
because it can be attacked by white's bishop. That is a good reason to choose
g4. But are there "tactical" reasons why Bg1 is wrong? Another thing that is
missing from Chezzz is knowledge about certain passed pawn situations.
Specifically, it knows nothing about outside passed pawns. I think this missing
knowledge could play a role, if not now, then later in the game. But you say
there are no important errors later in the game, so I will focus on this
position.
In fact, I can't even reproduce Bg1, if that is the mistake. And I've given it a
much longer think than it had yesterday, I think. So it must be the prefilled
hashtable that made the difference yesterday:
00:00:00.00 8n 01/00/02 +0.810 54. g4 (8)
00:00:00.01 23n 01/01/03 ---------------------------------------------------
00:00:00.01 61n 02/02/06 +0.740 54. g4 Bf6 (61)
00:00:00.03 185n 02/03/07 ---------------------------------------------------
00:00:00.03 279n 03/04/05 +0.700 54. g4 Bf6 55. Bb6 (279)
00:00:00.03 601n 03/05/07 +0.810 54. Bc1 Kc5 55. Be3+ Kd6 (601)
00:00:00.04 853n 03/05/07 ---------------------------------------------------
00:00:00.04 1294n 04/06/10 +0.810 54. Bc1 Kc5 55. Be3+ Kd6
56. g4 (1294)
00:00:00.04 1702n 04/07/10 ---------------------------------------------------
00:00:00.06 2798n 05/08/11 +0.700 54. Bc1 Kc5 55. Be3+ Kd6
56. g4 (2798)
00:00:00.06 5207n 05/09/11 +0.885 54. g4 Bf6 55. Bb6 e4
56. Bxa5 (5207)
00:00:00.08 5693n 05/09/12 ---------------------------------------------------
00:00:00.08 9991n 06/09/13 +0.745 54. g4 e4 55. Bc1 a4+
56. Kb4 Nd3+ 57. Kxa3 Nc5 (9991)
00:00:00.12 26kn 06/10/14 ---------------------------------------------------
00:00:00.14 34kn 07/10/13 +0.795 54. g4 e4 55. Bc1 Bf6
56. Bxb2 axb2 57. Kxb2 (34163)
00:00:00.15 43kn 07/12/14 ---------------------------------------------------
00:00:00.20 67kn 08/12/16 +0.720 54. g4 e4 55. Bc1 Be7
56. Bxb2 axb2 57. Kxb2 a4 (67038)
00:00:00.31 132kn 08/14/16 ---------------------------------------------------
00:00:00.45 208kn 09/14/17 +0.950 54. g4 e4 55. Bg1 Nd1
56. Kxa3 e3 57. Ka4 Kc5
58. Kb3 (208696)
00:00:00.47 217kn 09/14/17 ---------------------------------------------------
00:00:00.65 329kn 10/17/20 +0.775 54. g4 Nd1 55. Bc1 Nb2
56. Bxb2 axb2 57. Kxb2 Bb6
58. Ka3 e4 (329575)
00:00:00.76 395kn 10/17/21 ---------------------------------------------------
00:00:01.29 739kn 11/18/22 +0.945 54. g4 e4 55. Ba7 Bc7
56. Be3 Bd8 (739258)
00:00:01.36 769kn 11/18/22 ---------------------------------------------------
00:00:01.65 969kn 12/19/22 +0.750 54. g4 e4 55. Ba7 Bc7
56. Be3 Bd8 57. Bg1 (969498)
00:00:03.42 2068kn 12/21/22 ---------------------------------------------------
00:00:04.42 2697kn 13/21/23 +0.720 54. g4 e4 55. Bg1 Be7
56. Be3 Nd1 57. Ba7 e3
58. Nc1 Nf2 59. Bxe3 Nxg4
60. Bd4 (2697812)
00:00:07.29 4477kn 13/21/23 ---------------------------------------------------
00:00:09.79 6046kn 14/24/27 +0.545 54. g4 Nd1 55. Ba7 Nb2
56. Bg1 Bc7 57. Be3 Bd8
58. Ba7 Bc7 59. Bg1 Bd8
60. Bf2 e4 (6046756)
00:00:15.20 9529kn 14/25/27 +0.790 54. Ba7 e4 55. Be3 g4
56. Ba7 Bc7 57. Bd4 Kd7
58. c5 Bxg3 59. Kxa3 Nd3
60. Ka4 Bc7 (9529562)
00:00:15.83 9849kn 14/25/27 ---------------------------------------------------
00:00:21.68 13Mn 15/24/27 +0.660 54. Ba7 e4 55. g4 Be7
56. Be3 Bd8 (13501043)
00:00:25.90 15Mn 15/26/27 ---------------------------------------------------
00:00:33.40 20Mn 16/31/32 +0.660 54. Ba7 e4 55. g4 Be7
56. Be3 Bd8 (20488875)
00:00:36.22 21Mn 16/31/32 ---------------------------------------------------
00:01:17.67 46Mn 17/29/32 +0.660 54. Ba7 e4 55. g4 Be7
56. Be3 Bd8 (46836757)
00:01:23.50 49Mn 17/29/32 ---------------------------------------------------
force:34.95 204Mn 18/27/28 1/16 54. Ba7
Time used: 00:06:36.92
nps: 517090 nodes: 205248775 Q-nodes: 14622775 (7%)
move order: 93%
hash probes: 62836481 hash hits: 18278902 (29%) hash usage: 99%
pawn hash probes: 101133126 pawn hash hits: 100905891 (99%)
EGTB probes: 30492
/David
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