ECO D00 · Blackmar-Diemer Gambit Declined

Blackmar-Diemer Gambit Declined: Brombacher Countergambit

1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c5

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White to move. The arrow shows Stockfish’s best move.
Best move

5. dxc5−0.36

Black is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Blackmar-Diemer Gambit Declined: Brombacher Countergambit (D00), reached after 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c5, Stockfish 18 recommends 5. dxc5 for White. Black is slightly better (−0.36).

Top engine moves

  1. −0.365. dxc5 Qxd1+ 6. Kxd1 e5 7. Nxe4 Nxe4 8. fxe4 Bxc5 9. Nf3 Nc6
  2. −0.445. d5 exf3 6. Nxf3 g6 7. Bg5 Bg7 8. Qd2 O-O 9. Be2 Nbd7
  3. −0.595. Be3 cxd4 6. Qxd4 Qxd4 7. Bxd4 Nc6 8. Bxf6 gxf6 9. fxe4 Bh6

Frequently asked questions

What is the best move in the Blackmar-Diemer Gambit Declined: Brombacher Countergambit?
After 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c5, Stockfish 18 at depth 18 recommends 5. dxc5 for White, continuing Qxd1+ 6. Kxd1 e5 7. Nxe4 Nxe4 8. fxe4 Bxc5 9. Nf3 Nc6. Black is slightly better (−0.36). The next best moves are 5. d5 (−0.44) and 5. Be3 (−0.59).
Is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit a good opening?
Stockfish rates the position at −0.36: black is slightly better. Evaluations this early in the game are small, so practical results depend far more on knowing the plans and typical structures than on the engine's number.
What is the ECO code of the Blackmar-Diemer Gambit Declined: Brombacher Countergambit?
D00. ECO codes classify chess openings from A00 to E99; D is the volume for closed and semi-closed games.

Opening names from the Lichess opening book (CC0). Pieces by Colin M.L. Burnett (GPLv2+).