Author: Bruce Moreland
Date: 13:21:15 09/02/98
Go up one level in this thread
On September 01, 1998 at 15:57:49, Djordje Vidanovic wrote: >Bernhard Bauer claims that this kind of position NEVER occurs in real games... >But it does -- therefore I AM taking his claim *cum grano salis* :-) >Anyway, here goes: > >>[FEN "8/8/8/5pp1/8/1K6/2pp1Q2/2k5 w - - 0 1"] >>[PlyCount "5"] >>[EventDate "1907.??.??"] > >1. Qe3 f4 2. Qf2 d1=Q (2... f3 3. Qe3) 3. Kc3 f3 4. Qe3+ Kb1 5. Qb6+ Kc1 6. Qb2# >1-0 > >This is a relatively simple position where white wins in 12 plies or less, but >several programs fail to find Qe3, even after a search deeper than 12 plies. > >After at least 5 minutes on a PII-400 with 256 MB RAM, Hiarcs 6, Fritz 5, Mchess >7.1, Nimzo 98, Crafty 15.17, Exchess 2.34 and Junior 4.6 don’t find the >solution. Junior plays instantaneously Kc3?? and announces mate in 4, >overlooking the obvious underpromotion d1N+. > >Time to find Qe3 with a winning evaluation: >Genius 5W, 13 secs. >Rebel 9, 30 secs. >Rebel 10, 24 secs. >Shredder 2, 24 secs. > >>Strange that there is so much difference between programs in this position. > >>What would Ferret, Dark Thought and others play? Mine doesn't find this. I sacrifice some of the freakish cases. My thinking is that I would rather miss a few wins than find all of the losses. Hopefully I am not also sacrificing the non-freakish cases. Genius seems to have some stuff in it that lets it find some null-move killer positions quickly. I'm surprised that Shredder finds it. I don't know about Rebel. bruce
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.