Author: Simon Finn
Date: 10:51:55 10/17/01
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On October 17, 2001 at 06:19:46, Rafael Andrist wrote: >[D]6k1/8/7P/3pK3/8/8/2B5/8 w - - 0 1 > >As most of the others, my program knows that KBP-K with a rook pawn and bishop >of wrong colour is drawn if some conditions are met. In the position given above >black has also pawn and the position remains a theoretical draw. Now, my program >evaluates it as +3.5 and refuses to capture the black pawn. Of course I could >add this special case too but there are lots of other combinations of pieces I >had to add too. Did someone try a more general attempt to solve this problem? >Would the following rule work in this case? If White is ahead in material and if >it is a drawn KBP-K position after removing all black pieces, the position is a >draw. There are some positions where adding a Black pawn on g7 (vs White pawn on h5) or g6 (vs White pawn on h6) to converts a KBPKP draw to a loss by obstructing the Black king. There are lots of positions where adding 2 Black pawns (h+g or doubled g pawns) allows White to win. For example: [D]8/8/1k6/1p1K4/1p3B2/8/P7/8 w - - 0 1 bm Bd2 c0 "Kling & Horwitz 1851 (Fine #152)" [D]8/4k1p1/6Bp/7P/8/2K6/8/8 w - - 0 1 bm Kd4 c0 "Walker 1841 (Fine #153)" > >The problem are IMO possible Zugzwang positions which could occur, at least in >other types of drawn endgames with big material imbalance, e.g. KQ-KP. In this >case a theoretically drawn position could converted to a lost in some cases if a >black piece is added. That's what happens in both the above studies. I don't know any such cases where Black has no g-pawn. Perhaps that could be the basis for a generalised rule? Simon
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