Author: Mike S.
Date: 14:49:48 01/07/00
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On January 07, 2000 at 17:43:37, Mike S. wrote: >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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