Author: Peter McKenzie
Date: 11:05:35 02/27/01
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On February 27, 2001 at 12:18:53, Sune Larsson wrote: LambChop doesn't get this one, even after I play several moves down the line 1.Na5 bxa5 2.bxa5 Kd4 etc it doesn't see the draw. This is no great surprise, as there are many many delaying moves that white can do before the classic wrong bishop and a-pawn type position arises. Still, 6-man tablebases will solve this one easily :-) I'm not sure that it is worth adding rule-based knowledge to try to solve this one, but if anyone can think of a nice general rule then let me know! Peter > > [D]8/8/pp6/3b2K1/1P6/PN2k3/8/8 w - - 0 1 > > > This is old swedish chess history. The above position happened in a game > between Bergkvist and Stolz, Stockholm 1941. White is in deep trouble. > Knight moves to a1 or c2 will just lose the lonely one. But the knight > has a more brave possibility! 1.Na5!! actually saved the draw for white. > After 1.-bxa5 2.bxa5 black has the wrong bishop and white's king can just > make it to a1, if black goes for both the white a-pawns. > > The game went like this: 1.Na5!! Kd3 2.Kf6 Kc3 3.Ke5 Bg2 4.Kd6 b5 5.Kc5 Kb2 > 6.Kb6 Kxa3 7.Kxa6 ½-½ > > Test: This is a difficult one for chess programs and presupposes > extended knowledge about a/h pawn and the wrong bishop. > > Sune
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