Author: Peter Fendrich
Date: 15:41:44 05/29/01
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On May 29, 2001 at 17:19:09, Robert Hyatt wrote: >On May 29, 2001 at 14:21:13, Peter Fendrich wrote: > >>This position appeared in an ICC game: Guitje - TerraPi >> >>[D]2r3kb/5q1p/4pPp1/1p1pP3/p2P2Q1/PrP5/1P3R1R/2B3K1 w - - 0 42 >> >>the last move from Terra was 41... b5 >>Some moves earlier when white made g6, Terra decided to move the bishop from g7 >>to h8. >>Both Rb3 and Bh8 are locked in and Terra is absolutely unaware of the >>hopeless situation. Yes, Terra lost... >> >>I see two different but connected problems for computer programs here: >> - the closed position itself >> - the two blocked pieces. >> >>How do you solve/avoid positions like this? Terra has about equal eval for this >>position. >>It is of course possible to punish pawn chains like this in order to avoid >>closed positions but is that really a solution and how to deal with blocked >>positions? >> >>//Peter > > >First, this looks dead lost. I get big scores (>3) after a few seconds and 13 >plies. Yes it is but the point is that a search is needed and the search finds a tactical breaktrhrough but that's another story. The problem is the total unawareness of the situation up til now and the willingness to end up in a position like this. The fact remains that Terra gives a completely wrong static evaluation. How about Crafty? > >The position you gave is too late to repair. You have to recognize blocked >pawns _before_ they are blocked, which means the 'mistakes' were made earlier >in the game. I evaluate blocked pawns in Crafty, but I also evaluate pawn >levers and make sure I keep a pawn break opportunity alive to avoid getting >into totally closed positions... I don't like the idea to give punishment for things that theoretical aren't bad. A closed position can be a winning position even for a computer, if we could handle it.... > >Here you should probably find Rxh7 is crushing of course... //Peter
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