ECO B06 · Modern Defense

Modern Defense: Mongredien Defense, with Nf3

1. e4 g6 2. d4 Bg7 3. Nf3 b6

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

4. h4+0.92

White is clearly better. Stockfish 18, depth 18.

Analyze this position

In the Modern Defense: Mongredien Defense, with Nf3 (B06), reached after 1. e4 g6 2. d4 Bg7 3. Nf3 b6, Stockfish 18 recommends 4. h4 for White. White is clearly better (+0.92).

Top engine moves

  1. +0.924. h4 h5 5. Nc3 d6 6. Bf4 Nf6 7. Qd2 O-O 8. O-O-O Bg4
  2. +0.834. Nc3 d6 5. Bc4 e6 6. h4 h6 7. Qe2 Ne7 8. Be3 Nd7
  3. +0.754. e5 e6 5. h4 Ne7 6. Nc3 Bb7 7. Bf4 Nbc6 8. h5 h6

Frequently asked questions

What is the best move in the Modern Defense: Mongredien Defense, with Nf3?
After 1. e4 g6 2. d4 Bg7 3. Nf3 b6, Stockfish 18 at depth 18 recommends 4. h4 for White, continuing h5 5. Nc3 d6 6. Bf4 Nf6 7. Qd2 O-O 8. O-O-O Bg4. White is clearly better (+0.92). The next best moves are 4. Nc3 (+0.83) and 4. e5 (+0.75).
Is the Modern Defense: Mongredien Defense, with Nf3 a good opening?
Stockfish rates the position at +0.92: white is clearly 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 Modern Defense: Mongredien Defense, with Nf3?
B06. 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+).