For the new edition of the Sicilian Najdorf Powerbook 2024 we used exclusively games from the engine room of playchess.com. Nevertheless the number of games on which the book is based has risen to an incredible 3.91 million. That enables reliable statistical analyses not only for all the main lines but also for many side-lines. A must for all Najdorf players! The Sicilian Najdorf Powerbook 2024 is an opening book which you can use with your Fritz or ChessBase program. It does not contain a database – so no games are included in the package.