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Subject: Re: Selecting among book moves

Author: Bruce Moreland

Date: 10:50:52 06/20/98

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My method is as follows:

1) Completely discard any position that hasn't resulted in a couple of wins, and
some minimum number of games.  This tends to prune out unique games, and gets
rid of some duplicates but not all.

2) Discard positions that don't score above a certain percentage.  I don't
remember what this percentage is, but it doesn't matter much.  If the humans
score 25% in one line, it is probably bad.

3) If a line scores well, pretend it has been played more often than it has.

4) If a line scores not so well, pretend it has been played a litle less than it
has.

Then I just decide based upon frequency of appearance.  So less common
high-scoring lines tend to get played more than they otherwise would, and you
see a little less of the common stuff that doesn't score very well.

I used to have a very bad book, but now I think my book is fine.  I rarely come
out in a really bad position anymore.

bruce



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