Author: Ricardo Gibert
Date: 10:33:22 04/08/03
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On April 08, 2003 at 10:04:02, Uri Blass wrote: >[D]8/5pp1/4p1kp/1Q6/2rqP2P/8/5PP1/5RK1 w - - 0 27 > >This position happened in a game of movei. >For the game see http://f11.parsimony.net/forum16635/messages/46511.htm > >I found that latest movei also suffers from the same evaluation problem. > >Movei evaluates the position as almost equal. > >I found that Crafty and a lot of programs understand that black has a clear >advantage(more than 0.5 pawns for black from the >first iterations). > >I understand that black is better but the question is what factor in evaluation >helps a lot of programs to understand it. > >I can explain reasons to give advantage for black from program point of view: > >1)The black king is more advanced and it is known that the king should >be at the last rank except endgames. > >2)The white pawns are more advanced so by piece square table they >get bigger bonus after a move like h5+. > >Uri Comps will score the position as better for Black, because: (1) Black is more centralized (2) Black's Rook occupies an open file. (3) White's Rook passive. Plus a short amount of analysis will reveal that White's pawns on the 4th rank are in hot water. White's f-pawn is pinned and Black's Rook can readily occupy White's 2nd rank and increase the pressure. In the root position, Black should not be recieving a bonus for a "more active" King in the endgame, because in such major piece endings, King safety is still important. All that said, a human would play 1.Qb1 expecting a computer to continue 1...Qxe4 2.Rxe4 g3 with a technical draw. Though Black often has good practical chances in such endings, in this case, White's pawn structure is ideal with his h-pawn perfectly placed on h4. It's possible that there exists a program that understands such positions (with the addition of a lot of Rook endgame knowledge). I'd be curious to find out which ones can do this. Such a program would perhaps prefer something like 1...Rb4 2.Qe1, etc.
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