Author: blass uri
Date: 21:53:21 06/05/00
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On June 05, 2000 at 22:33:41, Bruce Moreland wrote: >On June 05, 2000 at 18:59:41, blass uri wrote: > >>On June 05, 2000 at 18:35:10, blass uri wrote: >> >><snipped> >>>[D]5k2/7K/6P1/1p6/1P3p2/1P6/8/8 b - - 0 1 >>> >>>In this position the static evaluation of Crafty is advantage for black because >>>it does not know that the white pawn cannot be stopped. >>> >>>It plays f3 with 4.96 pawns advantage for black at depth 1. >>>It is possible to know by evaluation that the white pawn also cannot be stopped >>>because the white king controls g7 and g8 >> >>It is possible to use the following simple rule: >>White pawn in the 6th rank is unstoppable if the white king control the queening >>square. >> >>It is possible to see also by evaluation that black will have to waste tempo >>and cannot promote the passed pawn because of the square of the black king. >> >>Uri > >This is a fine rule, but white doesn't get to this position since after Bxh6 >Kxh6, black can block the pawn if he's willing to give up his own pawn. White does not get to this position if black plays different moves but knowing to evaluate this position can save plies in the original position because after Bxh6 Kxh6 Kg8 it is easy to see by evaluation that white has advantage because white has one pawn advantage and there is no unstoppable passed pawn. <snipped> >I think it's important to given bonuses in positions like the one shown, where >the K is supporting the P, and not just in K+P endings, either. In K+P ending it is more important because there is an unstoppable passed pawn. In other endgames it is possible that black can sacrifice a piece for the pawn. Uri
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