Author: Uri Blass
Date: 04:08:43 10/31/01
Go up one level in this thread
On October 31, 2001 at 03:28:12, Terry McCracken wrote: >On October 30, 2001 at 19:49:30, John Merlino wrote: > >>On October 30, 2001 at 18:24:41, Terry McCracken wrote: >> >>>[D]r5k1/ppp2r1p/3p3b/3Pn3/1n2PPp1/1P2K1P1/PBB1N2q/R2Q3R B >>> >>> >>>How do your programmes evaluate this position? >>>Do they find forced mate? >>> >>>Terry >> >>CM8000 does not find the mate in under 10 minutes on my PIII-600. It sees: >> >>1...Rxf4 2.Rxh2 Rf3+ 3.Kd4 c5+ 4.dxc6ep b5 5.Bd3 Nexc6+ 6.Kc3 Bg7+ 7.Kd2 Rxd3+ >>8.Ke1 >> >>with an eval of -1.79. Is this the right line, and CM just hasn't seen far >>enough yet? Is there really a forced mate? >> >Yes it is! Fritz with help finds a mate in 14, it was shorter in the >actual game. > >I did this quickly so a shorter mate may exist? > > >1...Rf4! 2.Rxh2..Rf3+ 3.Kd4..Bg7!!4.Rxh7 I do not understand Rxh7 why not Ng1? Black may win by Rxg3 but I do not see a forced mate after it New position r5k1/ppp3bp/3p4/3Pn3/1n1KP1p1/1P3rP1/PBB4R/R2Q2N1 b - - 0 1 Analysis by Deep Fritz: 4...Nxc2+! +- (7.56) Depth: 1/3 00:00:00 4...c5+ 5.dxc6 Nexc6+ 6.Kc4 +- (4.75) Depth: 1/15 00:00:00 4...c5+ 5.dxc6 Nexc6+ 6.Kc4 +- (4.75) Depth: 1/15 00:00:00 4...c5+ 5.dxc6 Nexc6+ 6.Kc4 +- (4.75) Depth: 1/15 00:00:00 4...Ned3+! +- (4.69) Depth: 1/15 00:00:00 4...Ned3+! 5.e5 Bxe5+ 6.Ke4 +- (3.25) Depth: 1/15 00:00:00 1kN 4...Ned3+! +- (2.81) Depth: 2/14 00:00:00 1kN 4...Ned3+! 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 ± (0.94) Depth: 2/21 00:00:00 1kN 4...Ned3+ 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 a5+ 8.Kb5 ± (0.87) Depth: 3/19 00:00:01 9kN 4...Ned3+ 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 a5+ 8.Kb5 Nxd1 ± (0.87) Depth: 4/22 00:00:04 27kN 4...Ned3+ 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 a5+ 8.Kb5 Nxd1 9.Rxd1 ± (0.87) Depth: 5/24 00:00:11 82kN 4...Ned3+ 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 a5+ 8.Kb5 Nxd1 9.Rxd1 ± (0.87) Depth: 6/25 00:00:21 254kN 4...Ned3+ 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 Bc3+ 8.Ka3 Nxd1 9.Rxd1 Rxg3 10.Rxh7 ± (0.87) Depth: 7/27 00:00:23 830kN 4...c5+! ± (0.84) Depth: 7/31 00:00:24 1208kN 4...c5+! 5.dxc6 Ned3+ 6.Kc4 b5+ 7.Kxb5 Rb8+ 8.Ka4 Nxb2+ 9.Ka3 Nxd1 10.Rxd1 = (-0.03) Depth: 7/31 00:00:24 1369kN 4...c5+ 5.dxc6 Ned3+ 6.Kc4 b5+ 7.Kxb5 Rb8+ 8.Ka4 Nxb2+ 9.Ka3 Nxd1 10.Rxd1 = (-0.03) Depth: 8/27 00:00:25 2108kN 4...c5+ 5.dxc6 Ned3+ 6.Kc4 b5+ 7.Kxb5 Rb8+ 8.Ka4 Nxb2+ 9.Ka3 Nxd1 10.Rxd1 = (-0.03) Depth: 9/30 00:00:28 5276kN 4...c5+ 5.dxc6 Ned3+ 6.Kc4 b5+ 7.Kxb5 Rb8+ 8.Ka4 Nxb2+ 9.Ka3 Nxd1 10.Rxd1 = (-0.25) Depth: 10/33 00:00:37 13847kN 4...c5+-- = (0.06) Depth: 11/35 00:01:12 45384kN 4...c5+-- 5.dxc6 Ned3+ 6.e5 Bxe5+ 7.Kc4 b5+ 8.Kxb5 Rb8+ 9.Ka4 Nxb2+ 10.Ka3 = (0.00) Depth: 11/36 00:01:19 51404kN 4...Rxg3! = (0.12) Depth: 11/36 00:01:33 62806kN 4...Rxg3! 5.Ne2 Rf3 6.Ng1 c5+ 7.dxc6 Ned3+ 8.Kc4 b5+ 9.Kxb5 Rb8+ 10.Ka4 = (-0.22) Depth: 11/36 00:01:38 66522kN 4...Rxg3 5.Ne2 Rf3 6.Ng1 c5+ 7.dxc6 Ned3+ 8.Kc4 b5+ 9.Kxb5 Rb8+ 10.Ka4 = (-0.22) Depth: 12/35 00:02:55 126315kN 4...Rxg3! ³ (-0.53) Depth: 13/37 00:06:13 294192kN (Blass, Tel-aviv 31.10.2001) ..Rxh7 5.Ng1..c5+ 6.dxc ep. ..Nbc6+ >7.Kd5..Nb4+ 8.Kd4..Ned3+ 9.e5..Bxe5+ 10.Kc4..Rc8+ 11.Kb5..Rc5+ 12.Ka4..Nxb2+ >13.Kxb4..Bc3# >>jm >But mate it is! > > Terry
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