Chessbase Mega Database Download [best] -

To study elite theory, filter games to show only those between players rated 2600+ or 2700+.

If you play in rated tournaments, preparation is half the battle. By searching for your upcoming opponent's name in the database, you can generate a complete dossier of their opening repertoire, their preferences with White and Black, and the specific types of positions where they tend to make mistakes. Historical Endgame Study chessbase mega database download