The exciting new Opening Master chess database features a unique chess games collection with more than 31.4 million top human chess games, making it the largest human chess database without duplicates. Experience the power and flexibility of Google No.1 "biggest chess database"  to create the ultimate chess winning game. Become a member today and enjoy the biggest chess database package, all carefully selected with more than 20 years of research and development. Download OM OTB with 10.2 million games, OM CORR with 2.2 million games, or OM PORTAL with 19 million games.