Author: Uri Blass
Date: 09:03:41 03/04/01
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On March 04, 2001 at 11:28:51, Sune Larsson wrote: >On March 04, 2001 at 10:50:54, Enrique Irazoqui wrote: > >>On March 04, 2001 at 10:28:01, Sune Larsson wrote: >> >>> >>> [D]8/5pb1/7p/6PK/7P/Pk6/8/8 w - - 0 1 >>> >>> Ellison, 1972 >>> >>> No story around this one, except to show how tricky endgames with >>> very few pieces can be. One mistake and you're dead... >>> Here white is fighting for the draw. After 1.gxh6 he will find the >>> way, to the remaining black pawn, very long... >>> >>> Test: White to move and draw. It might be interesting to check if your >>> program can make it in a) blitz (5-10 min) b) rapidgame (30-60 min) >>> c) tournamentlevel (40/2). The solution is further down. >>> >>> Sune >> >>Deep Shredder picks g6 in a fraction of a second. Deep Fritz in 11 seconds, >>Gandalf 4.32h in 56, while Junior 7 beta and the Tigers don't see it in less >>than 5 minutes. > > Hi Enrique, why, in your opinion, do the top programs differ that much > in this position? Is it possible to trace down some lack of knowledge? > For the Tigers I guess it can have something to do with missing TB:s, > but Junior 7 beta?? 1)Programs can evaluate the position after after g6 fxg6 Kxg6 Bf8 as better for black and avoid g6 for this reason. 2)Even after seeing that g6 fxg6 is a draw they can still evaluate g6 f6 as not better than gxh6 Bh8. The difference between these 2 options is a positional difference and a small change in the evaluation can cause programs to see it or not to see it. Uri
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