Author: Dieter Buerssner
Date: 07:10:51 10/18/00
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 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
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