Author: Mark Young
Date: 11:20:16 08/29/99
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On August 29, 1999 at 13:30:20, Robert Hyatt wrote: >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... I don't know if this is a case of specuation by Hiarcs or something else. I did test some other programs on this position and they tend to agree with Hiarcs 7.32. 5 min search. Crafty 16.13 Fritz 5 Junior 5 Hiarcs 6 Hiarcs 7.32 +/= .43 +- 1.56 +- 2.07 +- 2.16 +- 2.23
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