ECO B07 · Modern Defense

Modern Defense: Geller's System

1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. c3

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

4… Nc6+0.43

White is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Modern Defense: Geller's System (B07), reached after 1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. c3, Stockfish 18 recommends 4… Nc6 for Black. White is slightly better (+0.43).

Top engine moves

  1. +0.434… Nc6 5. Be3 Nf6 6. Bd3 e5 7. O-O O-O 8. Nbd2 Ng4 9. Bg5
  2. +0.464… a5 5. Bd3 Nf6 6. O-O O-O 7. Be3 e5 8. Nbd2 Nbd7 9. h3
  3. +0.474… Nf6 5. Bd3 O-O 6. O-O Nbd7 7. Be3 e5 8. Nbd2 Ng4 9. Bg5

Frequently asked questions

What is the best move in the Modern Defense: Geller's System?
After 1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. c3, Stockfish 18 at depth 18 recommends 4… Nc6 for Black, continuing 5. Be3 Nf6 6. Bd3 e5 7. O-O O-O 8. Nbd2 Ng4 9. Bg5. White is slightly better (+0.43). The next best moves are 4… a5 (+0.46) and 4… Nf6 (+0.47).
Is the Modern Defense: Geller's System a good opening?
Stockfish rates the position at +0.43: white 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 Modern Defense: Geller's System?
B07. 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+).