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Subject: Strange move by La Dame Blanche

Author: eric guttenberg

Date: 17:15:20 09/14/99


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



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