Chess opening · ECO D00
Blackmar-Diemer Gambit Declined: Brombacher Countergambit
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1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c5
Blackmar-Diemer Gambit Declined: Brombacher Countergambit is catalogued under ECO code D00. It is reached after 4 moves (8 half-moves): 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c5. After the last move it is White to play. White opens 1. d4. It is a named variation of the Blackmar-Diemer Gambit Declined, which has 9 catalogued lines in total.