Author: Uri Blass
Date: 06:13:54 11/12/01
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On November 12, 2001 at 08:02:23, Gian-Carlo Pascutto wrote: >On November 12, 2001 at 06:22:04, Uri Blass wrote: > >>This position could happen in my crrespondence game >> >>[D]2r2rk1/p3q1pp/1p6/2bp1p2/4n3/1P2P1P1/PB3PBP/1QR1RbK1 w - - 0 25 >> >>If your program plays Bxe4 then it is materialistic(Bxe4 is the only move that >>does not lose material) >> >>If it plays Rxf1 then it is not materialistic >> >>It seems that most programs are not materialistic based on the test that I did. >>I guess also that most humans are not materialistic here and are going to prefer >>Rxf1 >> >>Uri > >Sjeng plays Bxe4 here. The difference between that and Rxf1 is 0.20 pawns. > >Basically, it does not believe f3 is a significant enough weakness if >black does not have the right bishop. > >Is being materialistic intrinsically 'bad' here? I do not know I prefer to sacrifice because white has a pair of bishops but I am not sure if I am right. Fortunately I was black in the game and did not have to consider this position because my opponent chose a different move. I analyze the game now when the game is practically over because I want to give comments for the game. I may try to give programs a long time to search the position after Bxe4 fxe4 Rxf1 in order to know better if white has big problems in that position. I will be happy if other people are going to do this task. Here is the analysis of an interesting position from this game I played Fritz's move Be2 and my opponent chose Rxd5 when this move is losing a pawn because of Deep tactics The relevant lines after 23...Be2 24.Rxd5 are 24...Qf7 25.Re5 Rcd8 and white can choose between 2 non trivial ways to lose a pawn: 26.g4 fxg4 27.Rxe4 Qxf2+ 28.Kh1 Bf3 29.Bxf3 Qxf3+ 30.Kg1 g3 and 26.Bh3 Bd3 27.Qa1 Qh5 In the game white chose 26.Rcxc5 and not one of these two options that are probably worse. Dov Rozenberg - Uri Blass [D]2r2rk1/p3q1pp/bp6/2bp1p2/4n3/1P2P1P1/PB3PBP/1QRR1NK1 b - - 0 1 Analysis by Deep Fritz: 23...Bxf1-- = (-0.06) Depth: 1/3 00:00:00 23...Bxf1-- = (-0.06) Depth: 1/5 00:00:00 23...Qe6! = (-0.16) Depth: 1/13 00:00:00 23...Qe6! = (-0.25) Depth: 1/13 00:00:00 23...Qe6 24.Bd4 Bxf1 = (-0.19) Depth: 2/11 00:00:00 23...Qe6 24.Bd4 Bxf1 25.Bxf1 Bxd4 = (-0.19) Depth: 3/17 00:00:00 1kN 23...Qe6 24.Qa1 Bxf1 25.Rxf1 Qg6 = (-0.16) Depth: 4/17 00:00:00 8kN 23...Rfd8! = (-0.19) Depth: 4/18 00:00:00 11kN 23...Rfd8! 24.Bd4 Be2 25.Re1 ³ (-0.28) Depth: 4/18 00:00:00 14kN 23...Rfd8 24.Bd4 Be2 25.Re1 Bxd4 26.exd4 = (-0.25) Depth: 5/20 00:00:00 28kN 23...Rfd8 24.Rc2 Qe6 25.Bd4 Re8 26.b4 Bxf1 = (-0.22) Depth: 6/24 00:00:00 88kN 23...Qe6! = (-0.25) Depth: 6/24 00:00:00 126kN 23...Qe6 24.Qa1 Rf7 25.Rc2 Re7 26.Bd4 Rec7 ³ (-0.28) Depth: 7/22 00:00:00 400kN 23...Qe6 24.b4 Bxf1 25.Rxf1 Be7 26.Qa1 Bf6 27.Bxf6 Rxc1 28.Rxc1 Rxf6 = (-0.03) Depth: 8/27 00:00:01 1126kN 23...Rfd8! = (-0.06) Depth: 8/27 00:00:01 1198kN 23...Rfd8! 24.Rc2 Qe6 25.Bd4 Re8 26.b4 Bxf1 27.Bxf1 Bxd4 28.Rxd4 = (-0.22) Depth: 8/27 00:00:02 1326kN 23...Rfd8 24.Rc2 Qe6 25.Bd4 Re8 26.b4 Bxf1 27.Bxf1 Bxd4 28.Rxd4 a5 = (-0.19) Depth: 9/27 00:00:03 2621kN 23...Rcd8! = (-0.22) Depth: 9/29 00:00:07 4625kN 23...Rcd8 24.Qc2 Qf7 25.Bd4 Ba3 26.Bb2 Rc8 27.Qb1 Bxb2 28.Qxb2 Bxf1 29.Bxf1 = (-0.13) Depth: 10/31 00:00:13 8747kN 23...Rfd8! = (-0.16) Depth: 10/31 00:00:14 9468kN 23...Rfd8! 24.Rc2 Qe6 25.Qa1 Rd7 26.a3 Re7 27.b4 Bd6 28.Rxc8+ Bxc8 = (-0.19) Depth: 10/31 00:00:18 12283kN 23...Rfd8 24.Rc2 Qe6 25.a3 Be7 26.b4 Rxc2 27.Qxc2 Rc8 28.Qa4 = (-0.16) Depth: 11/32 00:00:40 27486kN 23...Rcd8! = (-0.19) Depth: 11/32 00:00:42 29000kN 23...Rcd8 24.Qc2 Qf7 25.Bd4 Ba3 26.Bb2 Rc8 27.Qb1 Bxb2 28.Qxb2 Bxf1 29.Bxf1 = (-0.19) Depth: 12/32 00:01:24 58818kN 23...Be2! = (-0.22) Depth: 12/35 00:02:30 106588kN 23...Be2! 24.Rxd5 Qf7 25.Re5 Rcd8 26.g4 Bd3 27.Qa1 fxg4 28.Rxe4 Bxe4 ³ (-0.31) Depth: 12/35 00:02:36 110705kN 23...Be2 24.Rxd5 Qf7 25.Re5 Rcd8 26.g4 Bd3 27.Qa1 fxg4 28.Rxe4 ³ (-0.31) Depth: 13/35 00:03:12 136667kN 23...Be2 24.Rxd5 Qf7 25.Re5 Rcd8 26.g4 Bd3 27.Qa1 fxg4 28.Rxe4 Bxe4 29.Bxe4 ³ (-0.31) Depth: 14/38 00:05:49 249392kN 23...Be2 24.Rxd5 Qf7 25.Re5 Rcd8 26.g4 Bd3 27.Qa1 fxg4 28.Rxe4 Bxe4 ³ (-0.31) Depth: 15/38 00:15:32 652289kN 23...Be2 24.Rxd5 Qf7 25.Re5 Rcd8 26.Bh3 Bd3 27.Qa1 Ng5 28.Bg2 Be4 ³ (-0.28) Depth: 16/41 00:47:45 1996592kN 23...Be2 24.Rxd5 Qf7 25.Re5 Rcd8 26.Bh3 Bd3 27.Qa1 Ng5 28.Bg2 Be4 ³ (-0.38) Depth: 17/43 02:34:34 6595123kN 23...Be2 24.Re1 Bxf1 25.Rxf1 Nd2 26.Bxd5+ Kh8 27.Qd3 Nxf1 28.Kxf1 Qg5 29.Kg2 ³ (-0.38) Depth: 18/46 07:04:16 18289177kN (Blass, Tel-Aviv 26.04.2001) Uri
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