Author: Andrew Williams
Date: 07:42:45 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. > I think you can deal with this by saying in your eval that "White cannot win". So if you're about to return a score which is > 0 from White's point of view, you return 0 instead. >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. Andrew
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