"Play the Blackmar-Diemer gambit and mate will come by itself!" so wrote Emil Diemer (1908-1990), as he refashioned an opening once played by Armad Blackmar (1826-1888), which came to bear both their names. Diemer was an average player who shot to fame in the fifties and sixties through the popularity of his opening with the masses, especially in Germany and the Netherlands. The BDG with 1. d4 d5 2. e4!? has a large following and it does indeed go for the jugular early, as white plays for mate from move two. And in his latest Gambit Guide series, GM Boris Alterman shows even today that the BDG can be just as lethal.tal.