Advice on book building

[Norm Pollock]

I just want to add a few suggestions on filtering pgn games before using them to build a book.

1. Limit games to quality players in quality events. For example, minimum elo 2300+, no exhibitions.
2. Limit games to comparable opponents. For example, elo difference could have a maximum of 100.
3. Do not use Blitz or Speed or Armageddon games. They are tough to weed out because they are often not indicated.
4. Use games of at least 20 full moves.
5. Filter out games with early blunders, like for example, within the first 20 moves.