Author: Robert Hyatt
Date: 15:10:19 09/18/01
Go up one level in this thread
On September 18, 2001 at 18:08:32, Robert Hyatt wrote: >On September 18, 2001 at 17:17:35, Uri Blass wrote: > >>On September 18, 2001 at 16:33:08, Robert Hyatt wrote: >> >>>On September 18, 2001 at 13:24:45, Uri Blass wrote: >>> >>>> >>>>Note that I said that computers can safely evaluate +2 if they do not see a >>>>positional advantage for the side with less pawns. >>>> >>>>Having a distant majority is a positional advantage. >>> >>>Not when hardly _any_ programs recognize it. >>> >>> >>>> >>>>I also think that Ed is right and today search solves usually the problem of >>>>missevaluating pawn majority. >>> >>>I disagree. If you enter into a series of captures, you might burn all your >>>search on the captures and have none left to see what the majority is going to >>>do. So you take the first step, and then you are committed. And every move >>>you make sees your score drop as you begin to sense the problem. By the time >>>the forced trades are done, you realize you are lost, as a king and pawns ending >>>can be searched incredibly deeply. >> >>Can you give a position that demonstates your point? >> >>Uri > > >Here is a simple attempt: > >[D]2k5/1r6/3p1p2/n2p1p2/P2PpP2/R3P3/1BK5/8 b - - > >Here black has several moves to try, one which liquidates into a pawn up >(but dead lost) ending. Rxb2 Kxb2 Nc4+ Ka2 Nxa3 Kxa3 and white is a pawn >down, but winning easily. > >Once you start with Rxb2, you are committed. As if you try to back out and >not play Nc4 and Nxa3, you are an exchange down. And if you do recover the >material, you are dead lost. Add another such forced capture/recapture and >you have burned 6 plies. You won't see white winning all the black pawns >and winning. Note that I don't say there are not better moves for black here. The point was to show a move choice that commits you to a course of action that gets worse and worse as you go deeper and deeper.
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.