Chessbase Opening Encyclopedia 2013 Inexhaustible: database with over 4.5 million, more than 80 000 games are annotated. over 5200 opening surveys, many of which have been brought up to date access to the games via the large opening key 728 specialised theory databases / the new ChessBase Reader 2013 for access to the whole content of the DVD large opening book of all the games to give you a quick overview and statistics