Author: martin fierz
Date: 10:22:45 11/15/02
Go up one level in this thread
On November 15, 2002 at 12:41:19, Eduard Nemeth wrote: >On November 14, 2002 at 22:09:42, martin fierz wrote: > >>i was looking at eduard nemeth's page on computer chess and stumbled across the >>following famous position: >> >>[D]1k6/8/8/8/8/5p1p/PPP5/6K1 w - - 0 1 >> >>white is a pawn up but will lose the game. i first saw this position about 20 >>years ago when our coach showed it to us as kids - he let us choose which side >>we wanted to play, and we always wanted white of course, being materialistic :-) >>anyway, eduard says on his page that as long as he cared to look, fritz thought >>white was winning. i let fritz7 run over night on my laptop, with the result >>pasted below: it takes fritz over 10 hours on my old P3 450MHz to see that white >>is worse, and after 24 hours the score is not yet showing that white is lost. >>any engines do better on this? >> >>aloha >> martin >> >>Analysis by Fritz 7: >> >>1.a4 Kc7 2.b4 Kc6 3.c3 Kd5 4.a5 h2+ 5.Kxh2 Kc6 6.Kg3 >> +- (3.91) Depth: 10/18 00:00:00 58kN >>1.a4 Kc7 2.b4 Kd6 3.c4 Kc6 4.a5 >> +- (4.06) Depth: 11/17 00:00:00 73kN >>1.a4-- >> +- (3.78) Depth: 12/18 00:00:00 113kN >>1.a4 Kc7 2.b4 Kc6 3.b5+ Kb6 4.c4 f2+ 5.Kxf2 h2 6.Kg2 h1Q+ 7.Kxh1 >> +- (3.53) Depth: 12/18 00:00:00 128kN >>1.a4! >> +- (3.81) Depth: 13/20 00:00:01 191kN >>1.a4! >> +- (4.09) Depth: 13/20 00:00:01 207kN >>1.a4 Kc7 2.b4 Kc6 3.a5 Kb5 4.c3 >> +- (4.13) Depth: 13/20 00:00:01 227kN >>1.a4 Kc7 2.b4 Kd6 3.a5 Kc6 4.c4 >> +- (4.34) Depth: 14/21 00:00:02 344kN >>1.a4 Kc7 2.a5 Kd6 3.b4 Kd5 4.a6 Kc6 5.b5+ >> +- (4.13) Depth: 15/26 00:00:03 596kN >>1.a4-- >> +- (3.84) Depth: 16/27 00:00:05 1040kN >>1.a4 >> +- (3.84) Depth: 16/27 00:00:06 1083kN >>1.a4-- >> +- (3.56) Depth: 17/27 00:00:08 1464kN >>1.a4 Kb7 2.a5 Ka6 3.b4 Kb5 >> +- (3.50) Depth: 17/28 00:00:10 1671kN >>1.a4-- >> +- (3.22) Depth: 18/30 00:00:12 2366kN >>1.a4 >> +- (3.22) Depth: 18/30 00:00:13 2471kN >>1.a4 Kb7 2.a5 Ka6 3.b4 Kb5 >> +- (3.22) Depth: 19/32 00:00:17 3585kN >>1.a4-- >> +- (2.94) Depth: 20/33 00:00:22 5058kN >>1.a4 Kb7 2.a5 Ka6 3.b4 Kb5 >> +- (1.81) Depth: 20/33 00:00:26 6126kN >>1.a4 Kb7 2.a5 Ka6 3.b4 Kb5 >> +- (1.66) Depth: 21/36 00:00:38 9266kN >>1.a4 Kb7 2.a5 Ka6 3.b4 Kb5 >> +- (1.66) Depth: 22/39 00:01:02 16085kN >>1.a4-- >> ± (1.38) Depth: 23/40 00:01:34 24793kN >>1.a4 Kb7 2.a5 Ka6 3.b4 Kb5 >> ± (1.28) Depth: 23/42 00:02:56 51884kN >>1.a4 Kb7 2.a5 Ka6 3.b4 Kb5 >> ± (1.25) Depth: 24/42 00:04:15 74045kN >>1.a4 Kb7 2.a5 Ka6 3.b4 Kb5 >> ± (1.25) Depth: 25/44 00:06:46 116088kN >>1.a4 Kc7 2.a5 Kb7 3.b3 Ka6 >> ± (1.25) Depth: 26/47 00:19:01 320992kN >>1.a4-- >> ± (0.97) Depth: 27/49 00:38:23 644062kN >>1.a4 Ka7 2.a5 Ka6 3.b4 Kb5 4.c3 Ka6 5.c4 Ka7 >> µ (-1.22) Depth: 27/51 10:23:09 13057728kN >>1.a4-- >> -+ (-1.50) Depth: 28/52 10:42:25 13390390kN >> >>(Fierz, Honolulu 14.11.2002) > > >See here: > >http://www.beepworld.de/members37/computerschach/tests.htm > >Eduard hi eduard, as i wrote, i found this position on your page and still decided to ask here, as there is not much info on your page :-) e.g. you did not wait to see how long fritz would take to see black was winning. anyway, my next question is obvious: why can fritz7, arguably one of the best programs around, not see something in many hours that others can see in a few seconds?? aloha martin
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.