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Chess Opening Theory/1. d4/1...d5/2. e4
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Blackmar-Diemer gambit D00 Closed game
2. e4 · Blackmar-Diemer gambit
White offers their e4 pawn in exchange for quick development and open lines. At the professional level this move is considered somewhat suspect, but Black must be careful if they choose to take the pawn as there are many traps in this opening.
2...dxe4 accepts the gambit.
Black has three ways to decline the gambit.
2...e6 transposes to the French Defence
2...c6 transposes to the Caro-Kann Defence
2...Nc6 transposes to the Nimzowitsch Defence
2...c5 is a largely unexplored countergambit.
Theory table
1. d4 d5 2. e4
2
3
...dxe4
Nc3e5
=
French Defence (by transposition)
...e6
=
Caro-Kann Defence (by transposition)
...c6
=
Nimzowitsch Defence (by transposition)
...Nc6
=
...c5
=
References
See also
Blackmar-Diemer Gambit
Nunn's Chess Openings. 1999. John Nunn (Editor), Graham Burgess, John Emms, Joe Gallagher. 1-8574-4221-0.
Modern Chess Openings: MCO-14. 1999. Nick de Firmian, Walter Korn. 0-8129-3084-3.
fi:Shakkiaapinen/Peli/1. d4/1...d5/2. e4