Author: Bas Hamstra
Date: 02:09:12 09/15/99
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On September 14, 1999 at 20:15:20, eric guttenberg wrote: >This probably will not interest too many people because it doesn't involve >a top commercial program but it intrigued me. >I was playing white against La Dame Blanche on Winboard at g/25. The game >went 1.e4 c5; 2.Nf3 d6; 3.d4 c5xd4; 4.Nxd4 Nf6; 5.Nc3 g6; 6.Be3 Bg7; >7.f3 Nc6; 8.Bc4 0-0; 9.Qd2 Bd7; 10.0-0-0 Rc8; This was all in the >program's book. I then moved 11.Nb3 and after 11. ... Nb4, I blundered >with 12. Nd4?? which of course leaves the bishop on c4 en prise. But >instead of taking the bishop, LDB played 12. ... Nc6?? I repeated the >position with 13.Nb3 Nb4; 14.Nd4?? Nc6?? and so on. >Since I thought that La DameBlanche was a reasonably good Winboard engine >I couldn't figure out why she would fail to take a piece. But then I >realized that she made the move Nc6?? each time instantly. In each case >it restored the position at move 10, which is a book position. Evidently >the program thinks 12....Nc6 is a book move if it results in a book position >even if the move fails to win a hanging piece. > >eric Interesting. Still it is a working approach. I used it too in a database, and it catches many transpositions. If it can reach a book position it doesn't look *any* further. If it makes blunders, the blunder is in the book. Another interesting case to try with this method is the loss of 1 or 2 tempi in the opening. It will in such cases travel through openinglines "backward", ie moves such as "Nf3-g1" :) Regards, Bas Hamstra.
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