Author: Uri Blass
Date: 11:03:47 11/09/01
I am interested only in the losing material moves in the main line(the analysis inside the game is only to help programs to get the right conclusion) Luba kristol - Uri blass [B80] [Blass,U] 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 e6 7.Qd2 b5 8.f3 Bb7 9.0-0-0 Nbd7 10.g4 h6 11.Bd3 Ne5 12.Rhe1 b4 13.Nce2 d5 14.Ng3 a novelty? 14...dxe4 15.Bxe4 Nxe4 16.Nxe4 Bxe4 17.fxe4 Bc5 [17...Nxg4 18.Bf4 e5 19.Qg2 h5 20.h3 exd4 21.hxg4 Rc8 (21...Qf6 22.e5 Qxf4+ 23.Kb1) 22.e5 g5 23.gxh5 b3 24.axb3 gxf4 25.e6] 18.Qe2 Qb6 19.Kb1 0-0 20.Rd2 a5 21.Red1 Rfd8 22.h3 a4 23.Ka1 b3 24.a3 Rac8 25.cxb3 [25.c3 Bxa3 26.bxa3 (26.Nf3 Bxb2+ 27.Kxb2 Rxd2+ 28.Nxd2 a3+) 26...Qa5 27.Kb1 (27.Nb5 Rxd2 28.Bxd2 Nc4) 27...Nc4 28.Rd3 (28.Rc1 Nxa3+ 29.Kb2 Nc4+) 28...Nxa3+ 29.Kb2 Nc4+ 30.Kb1 Rxd4; 25.g5 Bxd4 26.Rxd4 Rxd4 27.Bxd4 Rxc2] 25...axb3 26.Kb1 Qb7 27.Bf4 Nc4 28.Rd3 Bxa3 29.Rxb3 Qa6 30.Rdd3 Bxb2 0-1 I am interested to know if it can be proved be only material evaluation after learning that Rac8 wins more than 1 pawn. Top programs have big positional scores so I cannot know how much of the score is positional and how much of the score is material and the result is that I cannot find the losing material mistakes of my opponent by regular programs. I believe that 24...Rdc8 simply wins a pawn when 24...Rac8 wins more than it but I am not sure Fritz said at move 24: 24...Rdc8 25.c3 Bxa3 26.Nb5 Bc5 27.Bxc5 Qxc5 28.Na3 Qe7 29.Rd6 Qh4 30.Qe3 -+ (-1.44) Depth: 19/45 22:52:22 62190875kN The question is if black can improve this line A possible try is 26...Bxb2+ but I could not prove a win for black by this line. Here is some analysis of yace after learning the lines that are posted for many hours(note that it did not finish depth 14 and it now searches move 29 out of 34 legal moves) It sees 1.77 pawns for black but the problem is that I do not know how much of this number is material and how much is positional. Luba kristol - Uri blass 2rr2k1/5pp1/1q2p2p/2b1n3/p2NP1P1/Pp2B2P/1PPRQ3/K2R4 w - - 0 1 Analysis by Yace 0.99.56: 25.cxb3 axb3 26.Qf1 Ra8 -+ (-1.77) Depth: 1 00:00:00 25.Nb5 Rxd2 26.Bxd2 bxc2 -+ (-1.68) Depth: 1 00:00:00 25.Nf3 Rxd2 26.Bxd2 bxc2 -+ (-1.67) Depth: 1 00:00:00 25.c4 µ (-1.05) Depth: 1 00:00:00 25.c4 Kh7 µ (-1.05) Depth: 2 00:00:00 25.c4 Kh7 µ (-1.05) Depth: 3 00:00:00 25.c4 Kh7 µ (-1.05) Depth: 4 00:00:00 25.c4 Kh7 µ (-1.05) Depth: 5 00:00:00 12kN 25.c4 Kh7 µ (-1.05) Depth: 7 00:00:00 173kN 25.c4 Bxa3 26.Nf3 Bxb2+ 27.Kxb2 Rxd2+ 28.Nxd2 Qb4 29.Kb1 a3 30.Bd4 Nxc4 31.Nf3 µ (-1.09) Depth: 11 00:01:26 29290kN 25.c4 Bxa3 26.Nf3 Rxd2 27.Rxd2 Bc5 28.Nxe5 Bxe3 29.Rd7 a3 30.Qd3 Bf4 31.Nxf7 µ (-1.35) Depth: 12 00:05:48 115153kN 25.c4 Bxa3 26.Nf3 Rxd2 27.Rxd2 Bc5 28.Nxe5 Bxe3 29.Rd7 a3 30.Qd3 Bf4 31.Nxf7 Qg1+ 32.Qb1 axb2+ µ (-1.35) Depth: 13 00:17:12 343221kN 25.c4 Bxa3 26.Nf3 Bxb2+ 27.Kxb2 Rxd2+ 28.Nxd2 a3+ 29.Ka1 Qb4 30.Bd4 Nxc4 31.Nf3 b2+ 32.Ka2 Na5 33.Rb1 e5 34.Rxb2 axb2 35.Qxb2 -+ (-1.75) Depth: 14 00:36:39 736549kN 25.c4 Bxa3 26.Nf3 Bxb2+ 27.Kxb2 Rxd2+ 28.Nxd2 a3+ 29.Ka1 Qb4 30.Bd4 Nxc4 31.Nxb3 Qxb3 32.Qd3 Qa4 33.Rc1 Rc6 34.Qc2 Qb4 35.Ka2 -+ (-2.68) Depth: 14 01:03:08 1259612kN 25.cxb3 axb3 26.Qf1 Ra8 -+ (-1.77) Depth: 14 01:05:28 1306276kN (Blass, Tel-aviv 09.11.2001) Yace learned after cxb3 axb3 that the game move kb1 is losing more than 2 pawns and the result is the following analysis Luba kristol - Uri blass 2rr2k1/5pp1/1q2p2p/2b1n3/3NP1P1/Pp2B2P/1P1RQ3/K2R4 w - - 0 1 Analysis by Yace 0.99.56: 26.Qb5 Qxb5 27.Nxb5 Rxd2 28.Bxd2 Rd8 = (-0.06) Depth: -1 00:00:00 17kN 26.Qb5 Bxd4 27.Qxb6 Bxb6 28.Bxb6 Rxd2 29.Kb1 ³ (-0.46) Depth: -1 00:00:00 17kN 26.Qb5 Bxd4 27.Qxb6 Bxb6 28.Rxd8+ Bxd8 29.Bc5 Bf6 -+ (-3.31) Depth: -1 00:00:00 17kN 26.Qf2 Bxd4 27.Bxd4 Rxd4 28.Rxd4 Nd3 29.Qxf7+ Kh7 -+ (-3.30) Depth: -1 00:00:00 17kN 26.Qf2 Nc4 27.e5 Nxd2 28.Rxd2 Qb7 29.Qf4 -+ (-1.99) Depth: -1 00:00:00 17kN 26.Nf3 Rxd2 27.Bxd2 Qb5 28.Qxb5 Nxf3 -+ (-1.98) Depth: -1 00:00:00 17kN 26.Nf3 Bxe3 27.Rxd8+ Rxd8 28.Rxd8+ Qxd8 29.Nxe5 Qd4 30.Qf3 = (-0.24) Depth: -1 00:00:00 17kN 26.Nf3 Rxd2 27.Bxd2 Bd6 28.Qe3 Qb7 29.Bb4 Nc4 = (-0.20) Depth: -1 00:00:01 415kN 26.Nf3 Nxf3 27.Rxd8+ Rxd8 28.Rxd8+ Qxd8 29.Bxc5 Qh4 30.Qf1 Ng5 31.Be7 Qxh3 32.Qxh3 Nxh3 ³ (-0.47) Depth: -1 00:00:02 846kN 26.Nf3 Rxd2 27.Bxd2 Bxa3 28.bxa3 Qc5 29.Bc1 Qc3+ 30.Bb2 Qxf3 31.Qxf3 Nxf3 32.a4 ³ (-0.64) Depth: -1 00:00:08 3320kN 26.Qf1 Rd7 27.Ne2 Rxd2 28.Bxd2 Be3 29.Bxe3 Nxg4 30.Bxb6 Kh7 ³ (-0.63) Depth: -1 00:00:18 7113kN 26.Qf1 Rd7 27.Ne2 Rxd2 28.Bxd2 Qc6 29.Qf4 Nd3 30.Qf3 Ne5 ³ (-0.51) Depth: -1 00:00:20 7872kN 26.Qf1 Rd7 27.Bg1 Rcd8 28.Nf3 Rxd2 29.Rxd2 Rxd2 30.Bxc5 Qxc5 31.Nxd2 ³ (-0.44) Depth: -1 00:00:45 17661kN 26.Qf1 Bxa3 27.bxa3 Nc4 28.Nxb3 Nxe3 29.Rxd8+ Rxd8 30.Rxd8+ Qxd8 31.Qe2 Qb6 32.Ka2 e5 33.Qd3 Kf8 ³ (-0.50) Depth: -1 00:03:17 74256kN 26.Qf1 Ra8 27.Nf3 Rxd2 28.Bxd2 Bxa3 29.bxa3 Rxa3+ 30.Kb1 Qc6 31.Ne1 Qxe4+ 32.Kb2 Nc4+ 33.Kc3 b2+ 34.Kb4 b1Q+ 35.Kc5 µ (-0.90) Depth: -1 00:10:16 231809kN 26.Qf1 Ra8 µ (-0.90) Depth: -1 00:11:23 256690kN 26.Qf1 Ra8 27.Kb1 Qb7 28.Nb5 Rxd2 29.Bxd2 Qxe4+ 30.Ka1 µ (-1.30) Depth: -1 00:16:36 366616kN 26.Qf1 Ra8 27.Qb5 Rxa3+ 28.bxa3 Bxd4+ 29.Rxd4 Qxb5 30.Rxd8+ Kh7 31.Bc1 Qe2 32.R8d2 Qxe4 33.Bb2 Nc4 34.Rf2 Nxb2 35.Kxb2 -+ (-1.77) Depth: -1 00:30:33 676232kN yace also learned that 26.g5 is bad and that 26.c3 is bad so it does not want to play them. yace used at least some minutes for every move in the relevant lines 25.c3,25.g5 and also some minutes about the game line 25.cxb3 axb3 26.Kb1 Qb7 Yace used more time mainly in cases when it needed it to get the score that I wanted that is more than 2 pawns advantage. I gave up when I saw that it analyzes 26.Qf1 for a long time and does not get the score that I hoped for and decided that 1.77 is close enough to the score that I hoped for. Uri
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