Description. The ChessBase Mega Database 2021 is the premiere chess database with over 8.4 million games from 1560 to 2020 in high quality. Packing more than 85,000 annotated games, Mega 2021 contains the world's largest collection of high-class analysed games. Train like a pro! Prepare for your opponents with ChessBase and the Mega Database 2021.. "/>