Author: Mike S.
Date: 14:43:37 01/07/00
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On January 07, 2000 at 16:41:27, Daniel Clausen wrote: >>When the book is o.k., then there will be a reason not to win the piece. > >I'm not so sure about this. Consider the following example: > [D]r1bqkbnr/pppp1ppp/2n5/4p1N1/2B1P3/8/PPPP1PPP/RNBQK2R/ w KQkq - >Here white can move Nf3 to reach a book position - or it could simply play Nxf7 >and win the rook. (...) Thanks for this instructive example; I was quite shocked by the idea that Hiarcs, Shredder etc. could do so - but they don't. I've checked Hiarcs 7.32, Shredder 3 and Bringer 1.5 with 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Ng5 Bf8, and all of them calculate and would play Nxf7 (but would be in the book again if white plays 5.Nf3). So I think if a program would transpose back after 4...Bf8, this is a big bug. So, transposing back should only be done if the board position itself is in the book - not only the one which can be reached. Thank god I'm no programmer, because I surely had overlooked this little detail... Regards, M.Scheidl
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