Author: Howard Exner
Date: 20:48:47 09/20/99
Go up one level in this thread
On September 20, 1999 at 22:29:16, KarinsDad wrote: >On September 20, 1999 at 18:36:42, Howard Exner wrote: > >>On September 20, 1999 at 14:42:27, Robert Hyatt wrote: >> >>> >>>Here are a couple of examples: >>> >>> +---+---+---+---+---+---+---+---+ >>> 8 | | | | | | | *K| | >>> +---+---+---+---+---+---+---+---+ >>> 7 | *P| *P| | | | *P| *P| *P| >>> +---+---+---+---+---+---+---+---+ >>> 6 | | | | | | | | | >>> +---+---+---+---+---+---+---+---+ >>> 5 | | | | | | | | | >>> +---+---+---+---+---+---+---+---+ >>> 4 | | | | | | | | | >>> +---+---+---+---+---+---+---+---+ >>> 3 | | | | | | | P | | >>> +---+---+---+---+---+---+---+---+ >>> 2 | P | P | P | | | | P | | >>> +---+---+---+---+---+---+---+---+ >>> 1 | | | | | | | K | | >>> +---+---+---+---+---+---+---+---+ >>> a b c d e f g h >>> >>> >>>(fen 6k1/pp3ppp/8/8/8/6P1/PPP3P1/6K1/ w) >>> >>>old (16.18 crafty) evaluates this as -36 (black is better) because of >>>those two doubled kingside pawns. new crafty says +.36 because white has >>>a potential outside passer on the c file, black can't force a passer without >>>the king helping. Better... >> >>Black can force a passer here without the king's help. >> >>Try the below artificial (and illegal) example on crafty. It will test >>whether black can force a passer without the king's help. It has that same pawn >>configuration on the king's side. >> >>1kb5/1p1p1ppp/1P1P4/8/8/1p1p2P1/1P1P2P1/K1B5 w > >Yes, black can get a passer. But cannot white also get a passer if black tries? >Hence, the kingside is effectively even (not taking into account how far >advanced the pawns are). Yes, black could force a promotion and then white promotes one move later. I was just puzzled by the statement that "black could not force a passer without the king helping". It does not matter much though because I think Bob is on the right track anyway as the two doubled pawns pose a tougher resistence than the two connected ones. These endings are tricky still. It's great to see the programmers , you, Bob and others, wrestle with tweaking the endgame play. Just like a sports professional trys to improve the weakest part of his game so to goes the battle with computers and their achilles heal, the endgame. Years back we all know how outright foolish computer endgame play was. Today it is a much more refined endeavor as many of the old "blind spots" are gone. > >KarinsDad :)
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