Author: Matthew White
Date: 14:41:10 06/21/03
Go up one level in this thread
On June 21, 2003 at 14:46:22, Ricardo Gibert wrote: >On June 21, 2003 at 14:14:46, Uri Blass wrote: > >>On June 21, 2003 at 14:03:14, Andrea Griffini wrote: >> >>>Sorry for the funky topic... but i wonder how do strong program >>>evaluate advanced pawns. I added a bonus table for free pawns >>>and multiple free pawns that get up to 300 when they're on the >>>7th rank >> >>3 pawns is too much. >>2 pawns is more logical. > >I would think this is too agressive. I would expect you would lose games for >silly reasons this way. A pawn on the 7th could be as good as a queen or doomed >to be lost leaving you pawn down (or worse if you sac to get the pawn there). >That's quite a swing. A pawn on the 7th should trigger an extension that would >hopefully give some clue as to what variety of 7th rank pawn you have. A static >eval of less than a pawn should avoid most silly sacs. > >BTW, it also makes a big difference whether you are in an ending or not. In the >middlegame, the pawn is likely lost. In an ending, such a pawn has much better >prospects. > >> >><snipped> >>>8/7p/5k2/5p2/p1p2P2/Pr1pPK2/1P1R3P/8 b - - bm Rxb2; id "WAC.002" >>> >>>Rxb2 looks obviously quite interesting even for a 1500 player :) >>>but how do program get to play it ? Do they really analyze all the >>>pointless checks the king will undergo or they will just consider >>>"positionally" that two pawns that far are well worth a rook in >>>these conditions ? >>> >>>Andrea >> >>Movei needs to analyze all the checks. >>It is possible to see it by evaluation before they promote but the rank of the >>pawn is not enough and you may need other factors. >> >>Uri It would seem to me that giving it a high value in the middlegame would cause an engine to do everything it could to prevent losing the pawn, no? I'm not sure if a pawn on the 7th is worth a minor piece if it is sufficiently blockaded, but giving it a high value in the middlegame might help prevent some nasty endgame situations.
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