Author: Robert Hyatt
Date: 10:11:35 10/18/00
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On October 18, 2000 at 10:49:11, Oliver Roese wrote: >On October 18, 2000 at 10:10:51, Dieter Buerssner wrote: > >>I am trying to find a relatively fool proof way, to detect, if >>an endgame with a rook pawn (or a doubled rook pawn) and the wrong >>bishop against a lonely king, is a draw. Ideally I would like an >>algorithm, that only needs the loosing king square (perhaps the >>winning king square), the pawn square and the side to move, and it >>should detect, if this is a draw. >> >>I tried so far, to only use the pawn square and the losing king >>square. When the loosing king is closer to the corner, than the >>pawn, it is a draw. When the distance is the same, the side to move >>will be better. But this does not allways work. I think, it would be better, to >>be certain of the draw, and in compilcated cases, that can not be decided, give >>a small positive score to the bishop side. Have you any ideas about a simple >>algorithm? Would it be different, when the rook pawn >>is doubled? And when the losing side has a pawn, that say is not too advanced? >> >>One nice example from Tarrasch "Das Schachspiel": >> >>[D] 8/4k3/8/7P/4B3/5K2/8/8 w - - 0 1 >> >>White wins with 1.h6 Kf7 2.Bh7 >> >Yeah, this is a win after 2..Kf6 Kf4 and white breaks through to g7. > >>Which programs, that have knowledge about this sort of endgame will >>show a winning score without search and TBs? I tried this with >>Crafty, and it shows a draw score up to depth 6. This is of course >>problem in this game, because it only takes a fraction of a second >>to reach depth 7, but it might be dangerous, when the position >>is reached in the search. >> >>Regards, >>Dieter > >Once a while i had a look at craftys sourcecode, and if i recall it correctly >there is dedicated code to handle this special endgame. >It might be possible, that you have found an evaluationbug. >I am currently not at home and have no access to the source code to check this >out. >Attract dr hyatts attention to see thats going on here. > >Oliver I will check. This is probably an exception I don't get... I want to make sure that the king can reach the queening square first. And it ought to handle this just fine. But it may well break. I will certainly look...
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