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likeawizard / polyglot-composer

A library to compose polyglot opening books from PGN game collections
GNU General Public License v3.0
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Recency: Newer games contribute more to weights than older ones. #31

Open Jonathan003 opened 7 months ago

Jonathan003 commented 7 months ago

Can you please add an option for Recency for calculating the book move weights. If a move is out of fashion in the input pgn file, it most of the time has a good reason.

likeawizard commented 7 months ago

I'll have look and think. But my initial reaction is - no, the polyglot format has a very specific meaning for the weights and that is purely based on the outcomes of the games win +2, draw +1 and moves for lost games are not included. I do not think tinkering with these weights is a good idea and breaking the expectation that the format is built on.

In that case I would probably suggest filtering games from the PGN file itself before composing a book. And I of course wan't to find the time to touch up possible filters which would exclude games from being added to the book.

Jonathan003 commented 7 months ago

Filtering out older games from the PGN before composing a book is a good plan but only if there is an alternative more recent game.