Author: Uri Blass
Date: 11:11:23 07/16/03
Go up one level in this thread
On July 16, 2003 at 08:16:29, Grzegorz Sidorowicz wrote: >On July 16, 2003 at 06:36:24, Uri Blass wrote: > >>On July 16, 2003 at 05:53:06, Grzegorz Sidorowicz wrote: >> >>>[D]8/6p1/P1b1pp2/2p1p3/1k4P1/3PP3/1PK5/5B2 w - -; >>> >>>bm Bg2! >> >>Why do you assume that programs cannot find it. >>Ruffian found it and I suspect that other programs can find it if you give them >>enough time(the time that is needed may be hours days or weeks or months depends >>on the quality of the program). > >Probably a large majority of chess programs can solve >every chess problem. >If any people say "...program can't find...." we usually must >thinking ....program can't find it in decent time. >At end of the sentece from the subject are characters ":)))" >It is laughter. > >I think this problem is difficult for chess programs using null moves, >but if Ruffian can find it in short time I think it is problem not for >all. >;-) I think that you are wrong. Bg2 has a threat to capture the bishop and some moves after it also has a threat to promote a queen. Maybe there seem to be no threat in the last plies but without null move pruning you also lose plies. Fritz8(with selectivity 0) cannot find it even at depth 16 and even after Bg2 Bxg2 it shows negative score at depth 17 so it means that it cannot solve it in the root position even at depth 19 or in other words it cannot solve it in a reasonable time without null move pruning. Here is the analysis with selectivity=0 Analysis of the root New game 8/6p1/P1b1pp2/2p1p3/1k4P1/3PP3/1PK5/5B2 w - - 0 1 Analysis by Fritz 8: 1.a7 f5 2.Kd2 Ka5 3.Bh3 Kb6 4.gxf5 exf5 5.Bxf5 = (-0.03) Depth: 7/16 00:00:00 42kN 1.a7 f5 2.Kd2 f4 3.e4 Ka5 4.Bg2 Kb6 = (0.06) Depth: 8/18 00:00:00 110kN 1.a7 f5 2.Kd1 f4 3.Bg2 f3 4.Bf1 Kb3 5.Ke1 Kxb2 = (0.00) Depth: 9/19 00:00:01 378kN 1.a7 e4 2.dxe4 Bxe4+ 3.Bd3 Bc6 4.Bg6 c4 5.Kd2 Kb3 6.Kc1 e5 7.Bf5 = (0.03) Depth: 10/21 00:00:03 1339kN 1.a7 e4 2.dxe4 Bxe4+ 3.Bd3 Bc6 4.Bg6 Ka5 5.Be8 Bh1 6.g5 Be4+ 7.Kc3 = (-0.03) Depth: 11/22 00:00:06 2460kN 1.a7 e4 2.dxe4 Bxe4+ 3.Bd3 Bc6 4.Bg6 Ka5 5.Kd3 Kb6 6.Bf7 Kxa7 7.Kc4 Kb6 = (-0.16) Depth: 12/27 00:00:12 5262kN 1.a7 e4 2.dxe4 Bxe4+ 3.Bd3 Bc6 4.Bg6 Ka5 5.Kd3 Kb6 6.Bf7 Kxa7 7.Bxe6 Kb6 8.e4 Kb5 = (-0.12) Depth: 13/26 00:00:27 11563kN, tb=1 1.a7 e4 2.dxe4 Bxe4+ 3.Bd3 Bc6 4.Bg6 Ka5 5.Kd3 Kb6 6.Bf7 Kxa7 7.Bxe6 Bf3 8.e4 = (-0.16) Depth: 14/31 00:01:01 25716kN, tb=2 1.a7 e4 2.dxe4 Bxe4+ 3.Bd3 Bc6 4.Bg6 Ka5 5.Kd3 Kb6 6.Bf7 e5 7.Kc4 Kxa7 8.Kxc5 Bd7 9.b4 Bxg4 = (-0.06) Depth: 15/36 00:02:20 59769kN, tb=6 1.a7 e4 2.dxe4 Bxe4+ 3.Bd3 Bc6 4.Bg6 Ka5 5.Kd3 Kb6 6.Bf7 e5 7.Kc4 Kxa7 8.Kxc5 Bd7 9.b4 = (-0.06) Depth: 16/37 00:04:58 127525kN, tb=29 (Blass, Tel-Aviv 16.07.2003) analysis after Bg2 Bxg2 New game 8/6p1/P3pp2/2p1p3/1k4P1/3PP3/1PK3b1/8 w - - 0 1 Analysis by Fritz 8: 2.e4 f5 3.gxf5 exf5 4.exf5 Kb5 5.a7 -+ (-2.97) Depth: 7/14 00:00:00 15kN 2.e4 f5 3.gxf5 exf5 4.exf5 Kb5 5.a7 Kb6 6.b4 -+ (-3.16) Depth: 8/17 00:00:00 30kN 2.e4 f5 3.gxf5 exf5 4.exf5 Kb5 5.a7 Kb6 6.b4 cxb4 7.Kb3 Bd5+ 8.Kxb4 Kxa7 -+ (-3.16) Depth: 9/19 00:00:00 77kN 2.e4 f5 3.gxf5 exf5 4.a7 fxe4 5.d4 e3 -+ (-2.91) Depth: 10/22 00:00:00 157kN 2.e4-- -+ (-3.19) Depth: 11/20 00:00:00 242kN 2.e4 f5 3.gxf5 exf5 4.a7 fxe4 5.d4 e3 6.dxe5 c4 7.e6 Bf3 8.e7 Bc6 -+ (-3.31) Depth: 11/23 00:00:00 310kN 2.e4 f5 3.gxf5 exf5 4.a7 fxe4 5.d4 e3 6.dxe5 c4 7.e6 Bf3 8.e7 Bc6 -+ (-3.31) Depth: 12/23 00:00:01 681kN 2.e4 f5 3.gxf5 exf5 4.a7 fxe4 5.d4 e3 6.dxe5 c4 7.e6 Bf3 8.e7 Bc6 -+ (-3.31) Depth: 13/31 00:00:03 1291kN 2.e4! -+ (-3.03) Depth: 14/27 00:00:06 2432kN, tb=1 2.e4 f5 3.gxf5 exf5 4.a7 fxe4 5.d4 e3 6.dxe5 c4 7.e6 Be4+ 8.Kd1 Bf3+ 9.Ke1 g5 10.e7 Bc6 -+ (-2.97) Depth: 14/28 00:00:06 2708kN, tb=2 2.e4! -+ (-2.69) Depth: 15/35 00:00:11 4906kN, tb=7 2.e4! -+ (-2.41) Depth: 15/35 00:00:14 6411kN, tb=7 2.e4 f5 3.gxf5 exf5 4.a7 fxe4 5.d4 e3 6.dxe5 Be4+ 7.Kd1 Bf3+ 8.Ke1 Bc6 9.e6 Ka5 10.e7 -+ (-2.22) Depth: 15/35 00:00:17 8241kN, tb=8 2.e4! -+ (-1.94) Depth: 16/36 00:00:32 15386kN, tb=24 2.e4 f5 3.gxf5 exf5 4.a7 fxe4 5.d4 e3 6.dxe5 Bc6 7.e6 e2 8.Kd2 c4 9.e7 e1Q+ 10.Kxe1 -+ (-1.75) Depth: 16/39 00:00:42 21025kN, tb=27 2.e4 f5 3.gxf5 exf5 4.a7 fxe4 5.d4 e3 6.dxe5 Bc6 7.e6 e2 8.Kd2 c4 9.e7 e1Q+ 10.Kxe1 -+ (-1.75) Depth: 17/44 00:01:04 30680kN, tb=79 2.e4! -+ (-1.47) Depth: 18/46 00:02:23 73357kN, tb=257 2.e4! µ (-1.19) Depth: 18/46 00:04:06 138279kN, tb=369 2.e4! ³ (-0.62) Depth: 18/46 00:06:15 218034kN, tb=473 (Blass, Tel-Aviv 16.07.2003) Uri
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.