Author: Robert Hyatt
Date: 11:02:05 04/29/00
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On April 29, 2000 at 13:54:10, Colin Frayn wrote: >OK folks, > >Here are two positions taken from a 16 position pawn endgame test suite that I >found somewhere. ColChess disagrees with both of the best moves given here, >giving alternative best moves both with won evaluations for many ply. I tested >Crafty and it agreed with ColChess for the few minutes that I left it for. > >Am I (and both programs) missing something clever, or are the best moves that >are given here both wrong? > > >---------- >Position 1 >---------- > >[D]6k1/7p/5P1K/8/8/8/7P/8 w - - > >Suggested best move : Kh5 >ColChess prefers : Kg5 (Spots at 20 ply that it's won) Kg5 is the correct move It is a mate in 18 counting that move. Kh5 is a draw. The position is wrong, or the best move is wrong. > >---------- >Position 2 >---------- > >[D]4k3/4Pp2/5P2/4K3/8/8/8/8 w - - > >Suggested best move : Kf4 >ColChess prefers : Kf5 (gives mate in 14 after 3 minutes' thinking, and at depth >of 22 ply) > This one is ok. Kf5 is a mate in 13. Kf4 is also a mate in 13. >Seems to me here that the black king is stuck to squares d7 and e8 and whatever >white does (within reason) it can't really go wrong. > >I'd kinda like to know if there's a bug in my evaluation function so that I can >fix it, but I hope that there isn't..... > >Cheers, >Colin
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