Blackmar Diemer Series: Books 1-4 is a box set bundle of 4 books in 1. The four books are:Blackmar-Diemer Games 1: Accepted with 412 gambit accepted games with commentary.Blackmar-Diemer Games 2: Declined with 225 gambit declined games with commentary.Blackmar-Diemer Theory 3: Accepted is a detailed theoretical analysis with evaluations.Blackmar-Diemer Theory 4: Declined is a detailed theoretical analysis with evaluations.The games in Books 1 & 2 include various anecdotes from the author. They come from many types of competition: from blitz to correspondence to tournament play. These books build from the less popular lines up front to the stronger lines near the back of each volume.Books 3 & 4 on the Blackmar-Diemer Gambit theory checked by computer chess engines. Jack Clauser proofread the first drafts of Books 3 & 4. He offered many helpful suggestions.BDGers Tom Purser and Lev Zilbermints provided encouragement and influenced the author Tim Sawyer. Learn chess opening attacks with tactics and strategy. What fun it is to chess games quickly. The Blackmar-Diemer Gambit gave me 30 years of fun games. Join the fun!