ECO D00 · Blackmar-Diemer Gambit Declined

Blackmar-Diemer Gambit Declined: O'Kelly Defense

1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c6

abcdefgh87654321
White to move. The arrow shows Stockfish’s best move.
Best move

5. Nxe4−0.16

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

Analyze this position

In the Blackmar-Diemer Gambit Declined: O'Kelly Defense (D00), reached after 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c6, Stockfish 18 recommends 5. Nxe4 for White. The position is roughly equal (−0.16).

Top engine moves

  1. −0.165. Nxe4 Nbd7 6. Be3 e5 7. Nxf6+ Nxf6 8. dxe5 Nd5 9. Bd4 Be7
  2. −0.325. fxe4 e5 6. dxe5 Qxd1+ 7. Nxd1 Nxe4 8. Nf3 Be6 9. Bd3 Nc5
  3. −0.515. Bc4 exf3 6. Nxf3 Bf5 7. Ne5 e6 8. g4 Bg6 9. g5 Nd5

Frequently asked questions

What is the best move in the Blackmar-Diemer Gambit Declined: O'Kelly Defense?
After 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c6, Stockfish 18 at depth 18 recommends 5. Nxe4 for White, continuing Nbd7 6. Be3 e5 7. Nxf6+ Nxf6 8. dxe5 Nd5 9. Bd4 Be7. The position is roughly equal (−0.16). The next best moves are 5. fxe4 (−0.32) and 5. Bc4 (−0.51).
Is the Blackmar-Diemer Gambit Declined: O'Kelly Defense a good opening?
Stockfish rates the position at −0.16: 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: O'Kelly 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+).