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Subject: A question about unwanted transpositions in the opening book

Author: Alessandro Scotti

Date: 15:07:25 10/07/04


Hi,
in the simple book I implemented for Kiwi 0.2a, there was the risk of incurring
in some classical blunders such as 1. e4 e5 2. Bb5 a6 3. Nf3 => Nc6 from book,
or 1. Nf3 Nf6 2. Ng1 => Ng8 from book. To avoid this I play from book only if
the start and end positions are both present. The above cases work ok but today
I was testing an idea from Dan Honeycutt and played: 1. e3 e5 2. e4 Nf6 3. Nf3
and Kiwi played 3... Ng8?? from the book! Argh! I have now added a check to
never play the reverse of a move that was already played... is this solution
good enough or there are more subtle bugs to discover? In my book, I only store
position hashcodes together with a frequency counter...



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