Author: Robert Hyatt
Date: 10:30:20 08/29/99
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On August 29, 1999 at 12:36:18, Ralf Elvsén wrote: >This is a position from a game Hiarcs 7.32 - Crafty 16.6 >Time 25 min/game, ChessBase interface etc, but that is not >important. > >6k1/1p4p1/p7/2Ppp3/1P6/P4KP1/5P1P/8 b - - 0 49 > >What is interesting is that Crafty (black) >thinks the position is about even, with a score fluctuating >around equality, while Hiarcs for several plies >has realized that it has a won position and >has a score about +2 (an exchange of rooks has just >taken place some plies ago). > >I checked 16.6 as a winboard engine, also 16.16: >same result. > >This is a serious mis-evaluation of >the pawn structure since white easily can produce >passed pawns on both sides of the board, while >blacks connected free pawns can do nothing. > >Bob, maybe you want to look into this... > > >Regards, Ralf This is a bit speculative by hiarcs... ie I have seen it do this same sort of evaluation and be dead wrong as well... the only thing I don't evaluate at present is pawn majorities which turn into distant passed pawns. It is on my todo list, and I have some code written that does pretty well but is not ready for testing on the servers yet... My version of crafty (16.17 as released) thinks black is worse here, by about 1/3 of a pawn... and as it advances pawns to make passed pawns, this gets worse. But there is always danger in these positions... and I only hope that I get more right than wrong... however, +2 here? Seems hard to fathom...
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