Author: Bernhard Bauer
Date: 01:43:40 03/19/01
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On March 19, 2001 at 04:27:48, Steffen Jakob wrote: >Hi, > >in a game between Hossa and Crafty the following position occured: > >[D]8/8/8/8/p7/Pb6/1P6/K2k4 w - - > >White gets mated in 6 moves: > >1.Kb1 Bc2+ 2.Ka1 Kc1 3.Ka2 Bb3+ >4.Ka1 Bc4 5.b4 a4xb3 6.a4 b2# > >Hossa sees this very fast of course, but when I looked at his analysis I saw >that he evaluated the first few plies as a draw. The reason for this is that >e.g. the position above matches an eval term where Hossa "sees" that black has a >wrong bishop (the extra white pawns are included in that term). And in fact >white's position seems to be very unlucky here. E.g. I think if white's king is >somewhere else than on a1 or b1 then it is a draw. Also if the b2 pawn wouldnt >be there or somewhere else it looks like a draw. I think that even if in the >same position the pawn a3 wouldnt be on the board it is a draw (?). > >So it seems as if this is a very rare exception to my rule that the maximum >score for the side with the bishop is a draw if one side has "a" or "h" pawns >and a wrong bishop and the other side has 1 or two pawns. > >Do other engines who have some knowledge in such positions have the same problem >in the static evaluation of that position? > >Can you think of extra conditions to handle this problem? > >Can you think of other positions where >- one side has only a or h pawns >- has the wrong bishop >- the weaker side has 2 pawns >- no pawn of the weak side is attacked by a pawn of the side with the bishop >- the a/h passers dont run in a trivial way >- it is a win for the bishop side??? > >Best wishes, >Steffen. You may want to test the following position from J. Awerbach too. [D]8/8/8/8/p7/Pb6/1P6/K2k4 w Kind regards Bernhard
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