Author: Steve McRiley
Date: 09:56:51 04/16/99
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>Hi > > >The below position is taken from the Book Secrets of Chess Analysis by Jan >timman. > >3q1rk1/1p3p2/r2p2pb/P1pP1n1p/2N2P2/1QPP4/6BP/1R3RK1 w - - id Geller - Spaasky; > > >28. Be4!!! Timman remarks "White appreciates the strength of the strongpoint f5 >and defers the capture on b7, which would give black the chance for a promising >exchange sacrifice. 28. Qxb7, Rxa5 29.Nxa5, Qxa5 and now 29.Qb2(to be able to >defend important weak points from d2 or c2). > > >I tested rebel on this position and it simply could not resist the pawn on b7! > However hiarcs6 after 82 sec Chose 28. Bh3!! which I think is about the same >as Be4. In my opinion this is a excellent positional test for computer programs >to see just how well they understand position. I suspect that only the strongest >programs will be able to resist the juicy pawn on B7. I also Tested MChess 8 >which chose Be4 after one minute thought and +76 evaluation. Here are the analysis I got. All on a PII 266 with 64 Mb hash. All programs run as engines under Fritz532 GUI. Analysis by Fritz 5.32: -------------------------- (Only Qxb7 before this) 1.Qxb7 Ra8 2.Be4 Bxf4 3.Bxf5 gxf5 4.Rb2 Kh8 5.Rg2 Qh4 ² (0.56) depth: 10/27 00:00:06 1307kN 1.Be4 ² (0.59) depth: 10/30 00:00:17 3843kN 1.Be4 Qf6 2.Qxb7 Raa8 3.Nb6 Rxa5 ² (0.63) depth: 10/30 00:00:21 4866kN 1.Be4 Qf6 2.Qxb7 Rfa8 3.Bxf5 Qxf5 4.Nxd6 Qg4+ 5.Kh1 R6a7 ² (0.50) depth: 11/34 00:00:43 10014kN 1.Be4 Qf6 2.Qxb7 Raa8 3.Nb6 Rxa5 4.Nd7 Qxc3 5.Bxf5 gxf5 ² (0.53) depth: 12/36 00:01:50 26137kN Analysis by Junior 5.0: ------------------------------ (Qxb7 before this) 1.Qxb7 Ra8 2.Qb2 Qf6 3.Qd2 Bg7 4.Rb3 Rfe8 5.Qf2 Rab8 6.Rfb1 Rxb3 7.Rxb3 ² (0.59) depth: 19 00:22:56 262601kN 1.Qxb7 Ra8 2.Qb2 Qf6 3.Qd2 Bg7 4.Rb3 Rfe8 5.Qf2 Rab8 6.Rfb1 Rxb3 7.Rxb3 Qd8 ² (0.62) depth: 20 00:36:44 424601kN (Qxb7 after 50 min) Analysis by Nimzo '99: ------------------------------- (Mixed Qxb7 and Be4 before this) 1.Qxb7 Ra8 2.Be4 Bxf4 3.Bxf5 gxf5 4.Rb2 Kh8 5.a6 Qh4 6.a7 ± (1.16) depth: 11/26 00:02:20 25317kN 1.Be4 ± (1.17) depth: 11/26 00:03:27 38694kN 1.Be4 Bxf4 2.Bxf5 Qg5+ 3.Kh1 Qxf5 4.Ne3 Bxe3 5.Qa4 ± (1.17) depth: 11/26 00:04:26 50254kN Analysis by Crafty 16.6: --------------------------- The analysis given by Crafty after 40 minutes at ply 13: ± (0.82): 1.Qxb7 Ra8 2.a6 Qh4 3.a7 Bxf4 4.Rxf4 Qxf4 5.Nb6 Qe3+ 6.Kh1 Rae8 7.a8Q Rxa8 ² (0.30): 1.Bh3 Bxf4 2.Bxf5 Qg5+ 3.Kh1 Qxf5 4.Qxb7 Raa8 5.Nxd6 Qg4 6.Nc4 ² (0.30): 1.Be4 Bxf4 2.Qxb7 Qg5+ 3.Kh1 Raa8 4.Bxf5 Qxf5 5.Nxd6 Qg4 6.Nc4 Analysis by Doctor? 3.0: ---------------------------- The analysis given by Doctor? 3.0 after 35 minutes ± (0.97): 1.Qxb7 Ra8 2.a6 Bg7 3.Rfc1 Qh4 4.a7 Qxf4 5.Rf1 Qg4 6.Rxf5 Qxf5 7.Nb6 Rxa7 8.Qxa7 Bxc3 = (0.24): 1.Be4 Bxf4 2.Qxb7 Qg5+ 3.Kh1 Rfa8 4.Bxf5 R6a7 5.Qb3 gxf5 6.Qb5 = (0.12): 1.Rb2 Ra7 2.Qb6 Qxb6 3.axb6 Ra4 4.Bh3 Rd8 5.Bxf5 gxf5 6.Re2 Bg7 /McRiley
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