Author: Mike S.
Date: 09:07:26 01/15/00
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Hi Henk, this could be a "null move" problem. I have tried this with Fritz6 light (from the demo); it doesn't find 2.axb6. The program might think that after 1.c7 Kxc7 2.axb6+ Kxb8 3.b7, if black makes the null move (=doesn't move) and white could move once again, the best (and only) move would be 4.bxa8Q+ Kxa8 with a draw. So Fritz may think, if 3.b7 is a draw even if white moves twice, it must be draw anyway if black can move normally in between. The zugzwang situation after 3.b7 is obviously not very well handled by the program. But I don't really exactly understand the null move logic (I'm afraid I don't even understand alpha-beta...), so I hope one of the programmers here can tell if it's a null move failure. If the move 2.axb6 is made, F6 light immediately shows # in 18 (# in 9 after 2...Kxb8) when 4 piece-tablebases are accessed. Regards, M.Scheidl P.S. What is the source of this position? I think I've seen it before.
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