Author: Robert Hyatt
Date: 18:30:07 11/26/00
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On November 26, 2000 at 18:19:44, Mike S. wrote: >In general, trading is good for the side being ahead in material. This is basic >chess knowledge, known to most programs. But in the endgame, it's often wrong to >trade the last pawn, if the resulting material doesn't allow to win (a common >rule known from beginner's books is, that even the advantage of a minor piece >usually is not enough to win in a PAWNLESS endgame). Actually the rule generally says "if ahead in material, trade pieces but _not_ pawns... if behind in material, trade pawns but not pieces..." That solves your problem... > >This important motif can be tested with the following position from CSS 5/98, >where Mr. R.Petrykowski reported from a game Fritz5/P133 vs. the Tasc R30. Does >your program keep the last pawn? > >[D]8/4kn1p/R7/6p1/4K2P/8/8/8 w - - 0 49 > >49.Kf5? gxh4, and the game ended in a draw. > >The only winning move seems to be 49.h5. > >I have tested some programs (with 4-piece TBs), for a few seconds on P3/700. The >all would play h5, or found it fast respectively: Comet B02, Doctor? 3.0, Fritz >5.32, Fritz 6 light, Hiarcs 6, Hiarcs 7.32, LiGo2000a, Junior 5 (0:15) - >although some still show a big advantage after Kf5 gxh4 too. > >Regards, >M.Scheidl
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