Author: Steffen Jakob
Date: 03:30:34 11/04/01
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On November 03, 2001 at 19:21:09, Robert Hyatt 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 > > >Try it with a simple search: > > 1 0.02 0.73 1. d6 > 1-> 0.02 0.73 1. d6 > 2 0.02 -- 1. d6 > 2 0.02 0.00 1. d6 e3 > 2-> 0.03 0.00 1. d6 e3 > 3 0.03 0.20 1. d6 e3 2. Kb5 > 3-> 0.04 0.20 1. d6 e3 2. Kb5 > 4 0.04 0.00 1. d6 e3 2. Kb5 e2 3. d7 e1=Q 4. d8=Q > 4-> 0.04 0.00 1. d6 e3 2. Kb5 e2 3. d7 e1=Q 4. d8=Q > 5 0.05 0.00 1. d6 e3 2. Kb5 e2 3. d7 e1=Q 4. d8=Q > > >The point is that once a move is made, the die is cast. And the evaluation >becomes correct... The original position has two plans... which give a >static evaluation fits... fortunately that is why we have a search to help >the evaluation. :) One move resolves the position.. Yes, but in other cases the position above will be a leaf node and might lead you to a totally wrong PV. Greetings, Steffen.
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