ECO D00 · Blackmar-Diemer Gambit Declined

Blackmar-Diemer Gambit Declined: Lamb Defense

1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Nc6

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

5. d5−0.14

The position is roughly equal. Stockfish 18, depth 18.

Analyze this position

In the Blackmar-Diemer Gambit Declined: Lamb Defense (D00), reached after 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Nc6, Stockfish 18 recommends 5. d5 for White. The position is roughly equal (−0.14).

Top engine moves

  1. −0.145. d5 Ne5 6. fxe4 e6 7. Nf3 Nxf3+ 8. Qxf3 exd5 9. Nxd5 Nxd5
  2. −0.195. Bb5 exf3 6. Nxf3 Bd7 7. O-O e6 8. d5 exd5 9. Bg5 a6
  3. −0.655. Be3 Nd5 6. Nxd5 Qxd5 7. a3 g6 8. c4 Qf5 9. g4 Qd7

Frequently asked questions

What is the best move in the Blackmar-Diemer Gambit Declined: Lamb Defense?
After 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Nc6, Stockfish 18 at depth 18 recommends 5. d5 for White, continuing Ne5 6. fxe4 e6 7. Nf3 Nxf3+ 8. Qxf3 exd5 9. Nxd5 Nxd5. The position is roughly equal (−0.14). The next best moves are 5. Bb5 (−0.19) and 5. Be3 (−0.65).
Is the Blackmar-Diemer Gambit Declined: Lamb Defense a good opening?
Stockfish rates the position at −0.14: the position is roughly equal. 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: Lamb 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+).