Chessy
King's Gambit Declined: Petrov's Defense 3.fxe5 — Playing as Black
This is the kind of opening that rewards sharp play. After 1.e4 e5 2.f4 Nf6 3.fxe5 Nxe4, White has a choice — and many of them are bad. From 254,608 games at this exact position, White scores a modest 51.5% while Black wins 45.8% of the time, a much higher share than in most open games. Stockfish rates the position +0.27, a tiny edge for White. That means you are only slightly worse — and if White picks anything other than the best move, you may get the better of things fast. The interactive drill below will sharpen your feel for this line.
Play the King's Gambit Declined: Petrov's Defense: fxe5 against the engine
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Play through these lines against a live engine in our interactive drill — you will learn to spot White's mistakes and punish them in your own games. Create a **
Create a free account →The Critical Moment: Why This Position Matters
After 1.e4 e5 2.f4 Nf6 3.fxe5 Nxe4, White holds the extra pawn on e5 but your knight sits actively in the centre. This is not a quiet position. White must decide whether to chase your knight or develop naturally. The statistics reveal one clear favourite: Nf3, played in 121,942 games (White scores 57.6%). That is the engine's only good move. Every other common reply — Qe2, d3, d4, Qf3, Bc4 — gives White a lower score or is outright losing. Your task is to know which of White's tries are dangerous and which ones you can punish immediately.
Punishing White's Most Common Mistakes
Three of the most-played alternatives to Nf3 are genuine mistakes according to Stockfish. Here is what that means for you as Black: - Qe2 (29,127 games) loses about 2.5 pawns' worth of advantage. White had much better with Nf3. - d3 (28,314 games) loses about 2.0 pawns. - d4 (27,788 games) loses about 2.1 pawns. If White plays any of these, you are no longer just slightly worse — you likely have the advantage. The engine wants Nf3 first; anything else is a present. Recognising these three mistake moves is the single most practical takeaway from this line.
The Engine's Best Continuation: What to Expect
After 1.e4 e5 2.f4 Nf6 3.fxe5 Nxe4, Stockfish's top move is 4.Nf3. The engine then suggests 4...Be7 5.d3 Ng5 as the best play for both sides. Notice the plan: you develop your bishop to e7, then when White pushes d3 attacking your knight, you retreat it to g5. From g5 the knight can go to e6 later or pressure f3, and Black's king remains flexible (short or long castling are both possibilities after ...0-0 or ...g6). This line keeps the game complex and balanced — exactly what you want when you are only slightly worse from the opening.
What the Numbers Tell Us About Your Chances
The Lichess database of 254,608 games at this position is huge enough to trust. Black wins 45.8% of games — that is nearly half, and well above typical results for second-player openings. White's win rate is 51.5% with draws at just 2.7%. Those low draws say this is a fighting line with few quiet exits. If you are comfortable in tactical, asymmetrical positions, this version of the King's Gambit Declined suits you. The main thing to remember: survive the opening and avoid giving White the easy Nf3 development for free — and if White plays Qe2, d3, or d4, seize the initiative.
Results across 254,608 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Nf3 | 121,942 | 57.6% |
| Qe2 | 29,127 | 45.7% |
| d3 | 28,314 | 46.3% |
| d4 | 27,788 | 45.4% |
| Qf3 | 16,841 | 53.4% |
| Bc4 | 11,511 | 42.1% |
Frequently asked questions
Is the King's Gambit Declined Petrov's Defense fxe5 good for Black?
It is a solid, fighting choice. Stockfish gives +0.27, meaning White has a tiny edge, but Black wins 45.8% of games from this position in practice. That is much higher than most openings where the second player scores in the low 40s. You are slightly worse but very much in the game.
What is White's best move after 3.fxe5 Nxe4?
The engine's top choice is 4.Nf3, continuing with Be7 d3 Ng5. This is the only move that keeps White's small advantage. Every other common reply — Qe2, d3, d4 — is a mistake that loses roughly 2.0 to 2.5 pawns of advantage.
How should Black respond to 4.Qe2 from White?
Qe2 is a mistake that loses about 2.5 pawns. You should be very happy to see it. Develop naturally and look to exploit the queen's early exposure. Your knight on e4 is not easily dislodged, and White's queen is a target.
Why does Nf3 score so well for White compared to other moves?
Nf3 develops a piece, attacks your knight on e4 indirectly, and prepares d3 to kick it away. White scores 57.6% with Nf3, while alternatives like Qe2 (45.7%), d3 (46.3%), and d4 (45.4%) all drop below 50%. Nf3 is simply the most principled move.