Author: Ron Murawski
Date: 09:30:09 11/03/01
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On November 03, 2001 at 11:08:20, Ron Murawski wrote: >On November 03, 2001 at 07:07:55, Colin Frayn wrote: > >>OK, this is probably the stupidest post you'll ever read on CCC. >> >>Take the following completely trivial endgame position; >> >>[D]8/8/8/3P3k/K3p3/8/8/8 w - - >> >>It's obvious to anyone who's ever vaguely heard of chess that this is a draw. >> >>However, if one carefully codes in the promotion squares algorithm, it's clear >>that the white king can catch the black pawn, but the black king cannot catch >>the white pawn (as it has the move). Now, the problem is that (obviously) if >>the white king attempts to catch the black pawn then of course the black king >>moves one square closer to the white pawn, and can now catch it. >> >>So, statically, how do you say that this is obviously a draw? Bear in mind that >>you have to be careful about similar positions where the extra square advantage >>given by the side with a passed pawn having the move might make all the >>difference. >> >>This has got to be easy, right? >> >>Incidentally, just so that I cover my back and prove that I'm not being totally >>stupid, Crafty v18.11 static evaluation scores this as +6.20 for white. >> >>Cheers, >>Col > >Colin, > >How about this approach? > >For queening pawns: If both pawns are unobstructed and do not pass through any >enemy-controlled squares and neither pawn gives check as it queens, then, from >the point of view of advancing pawns, this position is even. > >For king-chases-down-pawn: If both kings do not pass through enemy-controlled >squares and each can chase down the opposing pawn, then, from this point of >view, the position is even. > >Best regards, >Ron This is the amended advancing pawns logic; For queening pawns: If both pawns are unobstructed and do not pass through any enemy-controlled squares and neither pawn gives check as it queens and if the first pawn can't capture the 2nd pawn, then, from the point of view of advancing pawns, this position is even. Ron
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