Author: Thomas Lagershausen
Date: 13:27:38 01/15/01
Go up one level in this thread
On January 15, 2001 at 07:05:54, Mogens Larsen wrote: >On January 15, 2001 at 06:22:35, Thomas Lagershausen wrote: > >>>[D]1r2k1r1/3p1p2/2bR1Bp1/p1K1P2p/5P1P/1P6/3R4/8 w - - 0 32 >> >>It is now clear that two moves earlier the move 30.a5 is the winner. >>Black has no good alternative defense. >>For example 31...Ra6 32.Ra2 Ra7 33.b4 a4 34.b5 Ra5 35.Rxc6 dxc6 36.Rd2 Ra8 >>37.bxc6 and winning. Or 31...Rc8 and 32.Kb6! wins clear. >>So the real question is:"Wins a program with the white pieces after the 29th >>move by black? We know 30.a5! is a winner. > >I gave Gandalf a chance on my Athlon 800 with 56Mb hash. > >Analysis by Gandalf 4.32g: > >30.Kc3 b5 > = (0.09) Depth: 2 00:00:00 >30.Kc3 b5 31.axb5 Bxb5 > = (-0.01) Depth: 3 00:00:00 >30.Rd1 > = (0.01) Depth: 3 00:00:00 >30.Rd1 > = (0.01) Depth: 4 00:00:00 >30.Rd1 > = (0.01) Depth: 5 00:00:00 2kN >30.Kc3 > = (0.03) Depth: 5 00:00:00 2kN >30.Kc3 b5 31.axb5 Bxb5 32.R2d5 Rc8 > = (0.11) Depth: 5 00:00:00 2kN >30.Kc3 Rb8 31.Kc2 Be4+ 32.Kb2 Rb7 33.Rd1 > = (0.11) Depth: 6 00:00:00 25kN >30.Kc3 Rf8 31.Kb2 Rg8 32.Kc1 b5 33.axb5 Bxb5 > = (0.08) Depth: 7 00:00:00 79kN >30.Kc3 Rf8 31.Kd3 Rg8 32.Kc4 Rc8 33.Rd1 Ra8 > = (0.16) Depth: 8 00:00:01 232kN >30.Kc3 Rf8 31.Kd3 Rg8 32.Kc4 Rb8 33.Kc3 Ra8 34.Kc4 > = (0.16) Depth: 9 00:00:01 323kN >30.Kc3 Rf8 31.Kc2 Rg8 32.Kb2 Rf8 33.Kc3 b5 34.axb5 > = (0.14) Depth: 10 00:00:04 874kN >30.Kc3 Rf8 31.Kc2 Rg8 32.Kb2 Rf8 33.Kc3 Rg8 34.Kc4 > = (0.14) Depth: 11 00:00:06 1362kN >30.Kc3 Rf8 31.Kc2 Rg8 32.Kb2 Rf8 33.Kc3 Rg8 34.Kc4 > = (0.14) Depth: 12 00:00:08 2016kN >30.Kc3 Rf8 31.Kc2 Rg8 32.Kb2 Rf8 33.Kc3 Rg8 34.Kc4 Rc8 > = (0.14) Depth: 13 00:00:15 3621kN >30.Kc3 Rf8 31.Rc2 Rg8 32.Kd3 Ra5 33.Ke3 Rf8 34.Rcd2 Ra8 > = (0.12) Depth: 14 00:01:03 14559kN >30.a5 > = (0.14) Depth: 14 00:02:02 14559kN >30.a5 bxa5 31.Kxc5 Ra6 32.Ra2 Ra7 33.b4 a4 34.Rad2 Be4 > = (0.24) Depth: 14 00:02:21 14559kN >30.a5 bxa5 31.Kxc5 Rb8 32.Rxc6 dxc6 33.Kxc6 Kf8 34.Kc7 Ra8 > ² (0.46) Depth: 15 00:07:16 87829kN >30.a5 bxa5 31.Kxc5 Ra6 32.Ra2 Ra8 33.Kc4 Be4 34.b4 a4 > ² (0.57) Depth: 16 00:13:23 163041kN > >Regards, >Mogens Wow.Maybe Gandalf beets every other program in this position? I had only time to testing Rebel Century 3. Rebel needs 4 hours 28 minutes and 29 sec. to see 30.a5! CPU: K6-2+ 600 Mhz ply 16 Variation 9 score only +0,24 Rebel shows only 30.a5 ba5: 31.Ra2?! Bb7 I think now we have a difficult position for computers.
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