This is a chess monograph called "Blackmar-Diemer Gambit: The Vienna Defence, The Hari-Kari Gambit" which explores this chess opening: "1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Bf5 5. g4". The author has collected 146 completed chess games which are recorded in Algebraic Chess Notation. And there are 138 chess diagrams, too.
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