ECO D00 · Blackmar-Diemer Gambit Declined

Blackmar-Diemer Gambit Declined: Vienna Defense

1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Bf5

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

5. Bg5−0.44

Black is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Blackmar-Diemer Gambit Declined: Vienna Defense (D00), reached after 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Bf5, Stockfish 18 recommends 5. Bg5 for White. Black is slightly better (−0.44).

Top engine moves

  1. −0.445. Bg5 Nbd7 6. g4 Bg6 7. Qe2 e6 8. fxe4 c6 9. Bg2 h6
  2. −0.495. fxe4 Nxe4 6. Qf3 Nxc3 7. Qxf5 Nd5 8. Nf3 e6 9. Qh3 Nb4
  3. −0.695. g4 Bg6 6. g5 Nd5 7. Nxe4 e5 8. dxe5 Nc6 9. h4 Nxe5

Frequently asked questions

What is the best move in the Blackmar-Diemer Gambit Declined: Vienna Defense?
After 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Bf5, Stockfish 18 at depth 18 recommends 5. Bg5 for White, continuing Nbd7 6. g4 Bg6 7. Qe2 e6 8. fxe4 c6 9. Bg2 h6. Black is slightly better (−0.44). The next best moves are 5. fxe4 (−0.49) and 5. g4 (−0.69).
Is the Blackmar-Diemer Gambit Declined: Vienna Defense a good opening?
Stockfish rates the position at −0.44: 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: Vienna Defense?
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+).