ECO B00 · Rat Defense

Rat Defense: Fuller Gambit

1. e4 d6 2. f4 d5 3. exd5 Nf6

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

4. Nf3+0.43

White is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Rat Defense: Fuller Gambit (B00), reached after 1. e4 d6 2. f4 d5 3. exd5 Nf6, Stockfish 18 recommends 4. Nf3 for White. White is slightly better (+0.43).

Top engine moves

  1. +0.434. Nf3 Nxd5 5. d4 Bg4 6. c4 Bxf3 7. Qxf3 Nb4 8. Na3 e6
  2. +0.344. d4 Bg4 5. Nf3 Bxf3 6. Qxf3 Qxd5 7. Qxd5 Nxd5 8. g3 e6
  3. +0.254. Be2 Nxd5 5. d4 Bf5 6. Nf3 e6 7. O-O Be7 8. c4 Nb4

Frequently asked questions

What is the best move in the Rat Defense: Fuller Gambit?
After 1. e4 d6 2. f4 d5 3. exd5 Nf6, Stockfish 18 at depth 18 recommends 4. Nf3 for White, continuing Nxd5 5. d4 Bg4 6. c4 Bxf3 7. Qxf3 Nb4 8. Na3 e6. White is slightly better (+0.43). The next best moves are 4. d4 (+0.34) and 4. Be2 (+0.25).
Is the Rat Defense: Fuller Gambit 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 Rat Defense: Fuller Gambit?
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+).