Author: Eelco de Groot
Date: 07:31:17 10/14/01
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On October 14, 2001 at 09:19:03, Eduard Nemeth wrote: > >And this is a interesting testposition: > >[D]8/8/8/pp1b4/3P2k1/P1KN1bP1/8/8 w - - > > >My Fritz6 played here strong a4!! with a draw. Shredder an Tiger played here >an losing move! > >Regards, >Eduard Hi Eduard, Looking at your position Q5T version of Rebel Century plays 1.Nc5 and doesn't see a way out: [D]8/8/8/pp1b4/3P2k1/P1KN1bP1/8/8 w - - Rebel Engine for ECTool. (c) Ed Schröder Engine version : REBEL CENTURY 2 Rebel personality : "Q5T" Opening book file : RebelC.mvs Hash table size : 12 MB Analysis mode : Analyzing next move Refresh interval : 500 ms Game begin 00:00 08.01 -2.33 1.Nf4 Ba2 2.Ng6 Kxg3 3.Ne7 Bad5 4.Kd3 Kf4 00:00 09.00 -2.41 1.Nf4 Kxg3 2.Ng6 Bc4 3.Ne7 Bfd5 4.Nf5 Kf4 5.Ne7 00:01 09.01 -2.33 1.Nb4 axb4+ 2.Kxb4 Bc6 3.Kc5 Kxg3 4.Kd6 Kf4 5.Ke6 Bcd5+ 6.Kd6 00:02 10.00 -2.34 1.Nb4 axb4+ 2.Kxb4 Be2 3.Kc5 Bec4 4.Kd6 Kxg3 5.Ke5 00:02 10.02 -2.23 1.Nc5 Bg2 2.Na6 Bc6 3.Nc5 Kxg3 4.Nb3 a4 5.Nc5 Bce4 00:05 11.00 -2.70 1.Nc5 Kxg3 2.Nd3 Bfe4 00:13 12.00 -2.75 1.Nc5 Kxg3 2.Nd3 Bg2 3.Ne5 Kf4 00:31 13.00 -2.65 1.Nc5 Kxg3 2.Nd3 Kg4 3.Ne5+ Kf4 01:20 14.00 -2.72 1.Nc5 Kxg3 2.Nd7 Kf4+ 3.Nf6 Ba2 4.Kd3 Bc4+ 5.Kc3 Bfd5 6.Nd7 06:44 15.00 -2.79 1.Nc5 Kxg3 33:32 16.00 -2.94 1.Nc5 Kxg3 2.Nd7 Bg4 3.Ne5 I was curious what would happen after 1..bxa4 if as you say it is still a draw. The continuation that comes out of the computer seems alright but I think you are right; if a computer doesn't have special knowledge about this kind of ending it thinks it will end up a piece more. Even if you enter 1.a4 bxa4 2.Kb2 Kxg3 3.Ka3 Bc6 it still gives +3.6 for Black. But now I am curious does Fritz know here that it is a draw or was 1.a4 played without the right knowledge? Or is it not a draw after all? After 1.a4: Last Move : 1.a4 (Black to play) 00:00 08.00 3.65 1..bxa4 2.Kb2 Kxg3 3.Ka3 Bb3 4.Nc5 Bfd1 5.Nxb3 Bxb3 00:00 09.00 3.21 1..bxa4 2.Kb2 Kxg3 3.Ka3 Bc6 4.Nb2 Kf4 5.Nxa4 00:01 10.00 3.77 1..bxa4 2.Kb2 Kxg3 3.Ka3 Bb3 4.Nc5 Bfd1 5.Nxb3 Bxb3 6.Kb2 Bd5 7.Ka3 Kg4 00:03 11.00 3.14 1..bxa4 2.Kb2 Kxg3 3.Ka3 Bc6 4.Nb2 Kf4 5.Nc4 Bfe4 6.Nxa5 Bd7 00:08 12.00 3.20 1..bxa4 2.Kb2 Kxg3 3.Ka3 Bc6 4.Ne5 Bb5 5.Nxf3 Kxf3 6.d5 Ke4 7.d6 Bd7 8.Kb2 00:21 13.00 3.22 1..bxa4 2.Kb2 Kxg3 3.Ka3 Bc6 4.Nb2 Kf4 5.Nxa4 00:54 14.00 3.23 1..bxa4 2.Kb2 Kxg3 3.Ka3 Bb3 4.Nc5 Bfd1 5.Ne4 Kf4 03:39 15.00 3.20 1..bxa4 2.Kb2 Kxg3 3.Ka3 Bc6 4.Nb2 Kf4 5.Nd3+ Ke3 18:04 16.00 3.63 1..bxa4 2.Kb2 Kxg3 3.Ne5 After 1.a4 bxa4 2.Kb2 Kxg3 3.Ka3 Bc6 [D]8/8/2b5/p7/p2P4/K2N1bk1/8/8 w - - Last Move : 3... Bc6 (White to play) 00:00 01.06 -3.38 4.Nc5 00:00 07.03 -2.76 4.Ne5 Bb5 5.Nxf3 Kxf3 6.d5 Ke4 7.d6 Bd7 8.Kb2 00:02 10.00 -2.76 4.Nb2 Kf4 5.Nd3+ Ke3 6.Ne5 Bb5 7.Nxf3 Kxf3 8.d5 Ke4 9.d6 Bd7 00:02 11.00 -2.76 4.Nb2 Kf4 5.Nd3+ Ke3 6.Ne5 Bb5 7.Nxf3 Kxf3 8.d5 00:04 12.00 -3.04 4.Nb2 Kf4 5.Nxa4 Ke4 00:12 13.00 -3.29 4.Nb2 Kf4 5.Nxa4 Ke3 01:02 14.00 -3.01 4.Nb2 Kf4 5.Nxa4 Ke4 06:44 15.00 -3.11 4.Nb2 Kf4 5.Nxa4 Ke4 24:55 16.00 -3.59 4.Nb2 Kf4 5.Nxa4 What does Fritz 6 or 6x do in this position? Does it know it is a draw? Actually I should be studying and not chesspositions, tentams coming and I started a bit late, so I better sign off again... Groeten allemaal! Eelco
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