Author: Uri Blass
Date: 11:33:15 09/19/01
Go up one level in this thread
On September 19, 2001 at 13:29:52, Uri Blass wrote: >On September 16, 2001 at 15:55:14, Peter Berger wrote: > >>The logical one following the discussion: >> >>How long does it take your program to find 1...Ng4! ? It's easy to verify that >>everything else besides 1...Nxe4 and 1...Ng4 loses . Nxe4 loses also ( read the >>initial post) - so Ng4 is the only move . It seems to lead to a rather equal >>position, too btw. >> >>Regards, >> >>pete >> >>[D] 3r1r1k/p3bPpp/2bp1n2/5R2/1q1BP3/1Bp5/PPP3PP/1K1R1Q2 b - - 0 1 > >I suspect that Ng4 is not good >Here is Deep Fritz's analysis on p800 >It does not like to play Ng4 inspite of seeing a significant positional >advantage for white > >3r1r1k/p3bPpp/2bp1n2/5R2/1q1BP3/1Bp5/PPP3PP/1K1R1Q2 b - - 0 1 > >Analysis by Deep Fritz: > >1...Qxd4-- > ± (1.09) Depth: 1/3 00:00:00 >1...Qxd4-- 2.Rxd4 > +- (3.34) Depth: 1/6 00:00:00 >1...Qxb3! > +- (3.28) Depth: 1/9 00:00:00 >1...Qxb3! 2.axb3 > +- (3.25) Depth: 1/16 00:00:00 >1...cxb2! > +- (1.94) Depth: 1/16 00:00:00 >1...cxb2! > -+ (-2.22) Depth: 1/16 00:00:00 >1...cxb2-- > -+ (-1.81) Depth: 2/9 00:00:00 >1...cxb2-- 2.Rxf6 Bxf6 > µ (-0.91) Depth: 2/9 00:00:00 >1...Nxe4! > µ (-1.06) Depth: 2/9 00:00:00 >1...Nxe4! 2.a3 > -+ (-2.25) Depth: 2/12 00:00:00 1kN >1...Nxe4 2.a3 Qb7 > -+ (-2.09) Depth: 3/10 00:00:00 2kN >1...Nxe4 2.a3 Qb7 3.bxc3 > -+ (-2.25) Depth: 4/12 00:00:00 4kN >1...Nxe4 2.bxc3 Qb7 3.Qd3 Rb8 > -+ (-2.28) Depth: 5/16 00:00:00 17kN >1...Nxe4 2.bxc3 Qb7 3.Qd3 Rb8 4.Ka1 > -+ (-2.09) Depth: 6/17 00:00:00 30kN >1...Nxe4 2.bxc3 Qb7 3.Ka1 Rb8 4.Qd3 d5 > -+ (-2.19) Depth: 7/20 00:00:00 158kN >1...Nxe4 2.bxc3 Nxc3+ 3.Bxc3 Qxc3 4.Qe1 Qxe1 5.Rxe1 Bf6 6.g3 Rb8 > -+ (-1.94) Depth: 8/22 00:00:00 300kN >1...Nxe4 2.bxc3 Qb7 3.Qf4 d5 4.Qh6 Bf6 5.Rxf6 Nxf6 6.Bxf6 > -+ (-1.84) Depth: 9/23 00:00:01 949kN >1...Nxe4 2.a3 Qb7 3.Qf4 Nd2+ 4.Ka2 Nxb3 5.cxb3 cxb2 6.Bxg7+ Kxg7 7.Qg4+ > -+ (-1.66) Depth: 10/30 00:00:04 2689kN >1...Nxe4 2.bxc3 Nxc3+ 3.Bxc3 Qxc3 4.Qe1 Qxe1 5.Rxe1 Bf6 6.g4 Bd7 7.Rf4 > -+ (-1.94) Depth: 11/31 00:00:18 12091kN >1...Nxe4 2.bxc3 Nxc3+ 3.Bxc3 Qxc3 4.Qe1 Bf6 5.Qxc3 Bxc3 6.g3 Be4 7.Rf4 > -+ (-2.09) Depth: 12/33 00:00:46 29288kN >1...Nxe4-- > -+ (-1.78) Depth: 13/38 00:02:03 80372kN >1...Nxe4-- 2.Qf4 Ba8 3.bxc3 Qb7 4.Kc1 d5 5.Qe5 Bf6 6.Rxf6 Nxf6 > ³ (-0.44) Depth: 13/38 00:03:11 127149kN >1...Nxe4-- > = (-0.13) Depth: 14/41 00:09:13 378672kN >1...Nxe4-- 2.Qf4 cxb2 3.Rh5 Nf6 4.Rh6 Be4 5.Rxf6 d5 6.Re6 > = (0.12) Depth: 14/41 00:11:23 467952kN >1...Nxe4 2.Qf4 cxb2 3.Rh5 Nf6 4.Rh6 Ne4 5.Rh5 Nf6 6.Rh6 Ne4 7.Rh5 > = (0.00) Depth: 15/40 00:24:59 1034703kN >1...Nxe4 2.Qf4 cxb2 3.Rh5 Nf6 4.Rh6 Ne4 5.Rh5 Nf6 6.Rh6 Ne4 7.Rh5 > = (0.00) Depth: 16/43 00:47:47 1985049kN >1...Nxe4-- > ² (0.47) Depth: 17/44 01:26:11 3615463kN >1...Nxe4-- 2.Qf4 cxb2 3.Rh5 Nf6 4.Rh6 Ne4 5.Qf5 Ng5 6.Rh5 Be4 > ² (0.66) Depth: 17/46 03:18:00 8185065kN >1...Nxe4 2.Qf4 cxb2 3.Rh5 Nf6 4.Rh6 Ne4 5.Qf5 Ng5 6.Rh5 Be4 > ² (0.66) Depth: 18/46 07:17:58 18347252kN >1...Nxe4 2.Qf4 cxb2 3.Rh5 Nf6 4.Rh6 Ne4 5.Qf5 Ng5 6.Rh5 Be4 > ² (0.56) Depth: 19/50 20:29:22 51847398kN > >(Blass, Tel-aviv 19.09.2001) > >Uri Here is some analysis after 1...Ng4 Deep Fritz is very happy with Bxc3 but does not want to tell the reason. New position [D]3r1r1k/p3bPpp/2bp4/5R2/1q1BP1n1/1Bp5/PPP3PP/1K1R1Q2 w - - 0 1 Analysis by Deep Fritz: 2.Bxg7+-- -+ (-2.00) Depth: 1/4 00:00:00 2.Bxg7+-- Kxg7 -+ (-3.12) Depth: 1/4 00:00:00 2.Bxc3! -+ (-3.03) Depth: 1/4 00:00:00 2.Bxc3! Qxe4 µ (-0.72) Depth: 1/5 00:00:00 2.Qf3! ³ (-0.69) Depth: 1/10 00:00:00 2.Qf3 Nxh2 3.Bxc3 ³ (-0.69) Depth: 2/13 00:00:00 2.Qf4! ³ (-0.66) Depth: 2/13 00:00:00 2.Qf4! Bf6 3.Bxc3 ³ (-0.50) Depth: 2/13 00:00:00 2.Qf4! = (-0.19) Depth: 3/11 00:00:00 1kN 2.Qf4! Ne5 = (0.00) Depth: 3/13 00:00:00 2kN 2.Qf4 Ne5 3.Bxc3 Qxe4 4.Qxe4 = (0.00) Depth: 4/16 00:00:00 4kN 2.Bxc3! = (-0.12) Depth: 4/16 00:00:01 11kN 2.Bxc3! Qb7 3.Bd5 Bxd5 4.Rdxd5 Nxh2 = (0.19) Depth: 4/16 00:00:01 12kN 2.Bxc3 Qb7 3.Qf4 Ne5 4.Bd5 Bxd5 ² (0.38) Depth: 5/18 00:00:02 23kN 2.Bxc3 Qb7 3.Qf3 Nh6 4.Rf4 Rc8 ² (0.34) Depth: 6/17 00:00:03 42kN 2.Bxc3 Qb8 3.Qf4 Ne5 4.Bd5 Bd7 5.Rh5 = (0.22) Depth: 7/21 00:00:08 184kN 2.Bxc3 Qb8 3.Qf4 Ne5 4.Be6 Qc7 5.Bd5 Rc8 = (0.16) Depth: 8/20 00:00:09 429kN 2.Qa6! = (0.19) Depth: 8/25 00:00:10 1115kN 2.Qa6! Bd7 3.Qa5 d5 4.Qxb4 Bxb4 5.Rxd5 Rxf7 = (0.22) Depth: 8/25 00:00:10 1162kN 2.Qa6 Ne5 3.bxc3 Qb8 4.Qxa7 Qxa7 5.Bxa7 Bxe4 6.Rf2 d5 = (-0.03) Depth: 9/27 00:00:12 2778kN 2.Bxc3! = (0.00) Depth: 9/27 00:00:13 2978kN 2.Bxc3! Qb8 3.Qf4 Ne5 4.Be6 Qc7 5.Re1 Bd7 6.Bxd7 Nxd7 ² (0.38) Depth: 9/27 00:00:14 3561kN 2.Bxc3 Qb8 3.Qf4 Ne5 4.Re1 Qb7 5.Be6 Ng6 6.Qg4 d5 ² (0.31) Depth: 10/27 00:00:17 5623kN 2.Bxc3 Qb7 3.Qf4 Ne5 4.Bd5 Qc7 5.Bxe5 dxe5 6.Qxe5 Qxe5 7.Rxe5 Rxf7 = (0.19) Depth: 11/29 00:00:27 12512kN 2.Bxc3 Qb8 3.Qf4 Ne5 4.Re1 a6 5.Ka1 Bd7 6.Rxe5 dxe5 7.Qxe5 = (0.25) Depth: 12/32 00:01:05 37587kN 2.Bxc3 Qb7 3.Qf4 Ne5 4.Re1 Qb8 5.Rh5 Qc8 6.Bxe5 dxe5 ² (0.41) Depth: 13/34 00:02:36 99241kN 2.Bxc3 Qb7 3.Qf4 Ne5 4.Re1 Qd7 5.Bd5 Bxd5 6.exd5 Qc7 7.Qf2 ² (0.59) Depth: 14/36 00:05:06 201482kN 2.Bxc3! ± (0.91) Depth: 15/38 00:17:15 682613kN (Blass, Tel-aviv 19.09.2001)
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