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The Blackmar-Diemer Gambit is characterised by the 1. d4 d5 2. e4 dxe4 3. Nc3.

Popular amongst club players, it’s rarely seen at master level as its believed to allow black good chances to equalise.

Videos:

• Blackmar-Diemer Gambit – an introduction
• The Halosar Trap of the Blackmar-Diemer Gambit

Other resources:

• Wikipedia – Blackmar-Diemer Gambit
• Wikibooks – Blackmar-Diemer Gambit