ECO B00 · Lion Defense

Lion Defense: Lion's Jaw

1. e4 d6 2. d4 Nf6 3. f3

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

3… e5+0.29

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

Analyze this position

In the Lion Defense: Lion's Jaw (B00), reached after 1. e4 d6 2. d4 Nf6 3. f3, Stockfish 18 recommends 3… e5 for Black. The position is roughly equal (+0.29).

Top engine moves

  1. +0.293… e5 4. d5 Be7 5. Be3 c6 6. c4 b5 7. Nc3 b4 8. Na4
  2. +0.373… e6 4. Be3 Be7 5. c4 O-O 6. Nc3 c5 7. dxc5 dxc5 8. e5
  3. +0.413… c6 4. Be3 e5 5. dxe5 dxe5 6. Qxd8+ Kxd8 7. Bc4 Ke8 8. Ne2

Frequently asked questions

What is the best move in the Lion Defense: Lion's Jaw?
After 1. e4 d6 2. d4 Nf6 3. f3, Stockfish 18 at depth 18 recommends 3… e5 for Black, continuing 4. d5 Be7 5. Be3 c6 6. c4 b5 7. Nc3 b4 8. Na4. The position is roughly equal (+0.29). The next best moves are 3… e6 (+0.37) and 3… c6 (+0.41).
Is the Lion Defense: Lion's Jaw a good opening?
Stockfish rates the position at +0.29: 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 Lion Defense: Lion's Jaw?
B00. ECO codes classify chess openings from A00 to E99; B is the volume for semi-open games (other than the French).

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