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Subject: Re: Thanks Norm (NT)

Author: David Dahlem

Date: 11:44:18 01/13/05

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On January 13, 2005 at 14:39:35, Norm Pollock wrote:

>On January 13, 2005 at 12:58:47, David Dahlem wrote:
>
>>Hi Norm
>>
>>I'm currently downloading your pgn database from Peter Skinners site. Could you
>>provide details on how you filtered this database?
>>
>>Thanks
>>Dave
>
>Games are from jan 1, 2000 to present. Sources are TWIC and ChessCollect
>
>Filtered out (as best as possible) using Scid 3.61 and pgn-extract: players
>under 2400 elo, games with [FEN (includes FRC), blindfold, blitz, rapid,
>lightning, simultaneous, email, twins and duplicates, computer engines, 20 moves
>(40 plies) or less, games on the Internet (ICC, FICS, playchess, IEC), unusual
>ratings or unusual names.
>
>And of course you have the option of filtering out even more.
>
>Stripped out excess tags.
>
>Some suggestions for book builders:
>Use a high number of occurrences if you are building a book. I recommend 12. Do
>not use book learning if multiple engines share the book. The two book approach-
>a white book and a black book is better than the 1 book approach. That is
>because you can build the white book just from games that white wins/draws, and
>build the black book just from games that black wins/draws.



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