The King's Gambit is the chess opening 1.e4 e5 2.f4. White offers the f-pawn on move two to deflect Black's e-pawn, take the center with d4 and open the f-file toward f7. If Black takes with 2...exf4 it is the King's Gambit Accepted; any other reply is the King's Gambit Declined, and the price of the whole idea is that 2.f4 also loosens White's own king.
How to reach the King's Gambit
There is one direct move order: 1.e4 e5 2.f4. White plays it on move two, before Black has committed a piece, so Black chooses the type of game immediately: take the pawn, counterattack with 2...d5, or decline with a developing move such as 2...Bc5.
Start
Two transpositions matter in practice:
- From the Vienna Game. 1.e4 e5 2.Nc3 Nc6 3.f4 is the Vienna Gambit, a close relative. If Black then takes on f4 and White follows with Nf3, the play is a King's Gambit with Nc3 already developed. The Vienna Game guide covers that route.
- From the Bishop's Opening. 1.e4 e5 2.Bc4 followed by f4 reaches the same structures as the Bishop's Gambit (3.Bc4 below).
After 2.f4 Black has 30 legal moves. Only a handful are serious, and the engine prefers taking the pawn.
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Strengths and drawbacks
Strengths for White
- Two center pawns against one after Black takes and White plays d4.
- A half-open f-file aimed at f7, the square only Black's king defends.
- Fast development: the pawn buys tempi for Nf3, Bc4, d4 and castling.
- Black must know concrete theory; natural moves are often wrong.
Drawbacks for White
- The e1–h4 diagonal opens, so ...Qh4+ is a threat in many lines.
- White is objectively worse: Stockfish 17.1 scores 2.f4 at about −0.5.
- Short castling is harder, and in several lines the king goes to f1 or stays in the center.
- Accurate defenders can return the pawn and reach a comfortable position, which kills White's practical chances.
Main variations
Kieseritzky Gambit: 3.Nf3 g5 4.h4 g4 5.Ne5
The sharpest classical answer is to take the pawn and defend it with ...g5. White breaks that pawn chain at once with h4; after 4...g4 the knight jumps forward to e5 instead of retreating. This is the Kieseritzky Gambit, which modern writers treat as the main line after 3...g5.
Start
- 3.Nf3 stops ...Qh4+, the check that makes every King's Gambit player nervous.
- 3...g5 defends the extra pawn on f4 with another pawn.
- 5...Nf6 6.d4 d6 develops with tempo and kicks the knight.
- 7.Nd3 Nxe4 wins the e4-pawn, so White is two pawns down for a moment.
- 8.Bxf4 Bg7 9.Nd2 wins one pawn back and prepares Nxe4 to trade off Black's best piece.
White gets open lines; Black keeps a pawn and the safer king. It suits players who know theory and like messy, tactical positions.
Modern Defense: 3.Nf3 d5
Start
Black strikes in the center instead of holding the pawn: ...d5 opens Black's bishops and the knight recaptures on d5. White castles, plays d4 and aims to win back f4 with Bxf4 or c4. Stockfish rates the position after 6...Be7 at +0.09, so this is the cleanest way for Black to reach an easy, balanced game, and the line most White players dread least because the position stays playable for both sides.
Fischer Defense: 3.Nf3 d6
Start
3...d6 takes the e5-square away from White's knight, so after h4 g4 it has no forward jump and must go back to g1. White has spent tempi but owns a big pawn center and will hunt the f4-pawn with Nc3, Nge2 and Bxf4. Stockfish scores the position after 6.Ng1 at −0.74, with 6...Qf6 the top reply. It suits Black players who want the extra pawn and a sound structure.
Muzio Gambit: 3.Nf3 g5 4.Bc4 g4 5.O-O
Start
White offers a whole knight: after 5...gxf3 6.Qxf3, the queen, rook and bishop all aim at f7. It is the most extreme line of the opening. Stockfish scores the position after 6.Qxf3 at −1.08 with 6...Qf6, so Black is better with exact defense, but one natural-looking mistake can lose on the spot. Play it in blitz, not in a game you need to draw.
Bishop's Gambit: 3.Bc4
Start
White develops the bishop toward f7 first and allows ...Qh4+, accepting that the king will walk to f1. Black hits e4 and prepares ...d5. Stockfish: −0.30 after 4...c6, with 5.d4 the best try. This was the line of the famous 1851 Immortal Game (see History).
Falkbeer Countergambit: 2...d5
Start
Black ignores the f-pawn and counterattacks in the center. In modern practice Black takes on f4 on move three and develops with ...Nf6, reaching a position close to the Modern Defense. Stockfish scores it at −0.15 after 4...Nf6, with 5.c4 the top choice to keep the extra d5-pawn for a while.
Classical Declined: 2...Bc5
Start
Black refuses the pawn and puts the bishop on the g1–a7 diagonal, where it stops White from castling short. White plays c3 and d4 to blunt it. Stockfish scores the position after 4...Nf6 at +0.24, so declining gives White a normal, slightly better game. After 5.d4 exd4 6.cxd4, retreat with 6...Bb6; 6...Bb4+ 7.Bd2 is +0.62 for White.
| Variation | Moves | Character |
|---|---|---|
| Kieseritzky Gambit | 2...exf4 3.Nf3 g5 4.h4 g4 5.Ne5 | Sharp main line, piece play against Black's pawn chain |
| Modern Defense | 2...exf4 3.Nf3 d5 | Black returns the tension, balanced open game |
| Fischer Defense | 2...exf4 3.Nf3 d6 | Black keeps the pawn, White builds a center |
| Muzio Gambit | 2...exf4 3.Nf3 g5 4.Bc4 g4 5.O-O | Piece sacrifice, all-out attack on f7 |
| Bishop's Gambit | 2...exf4 3.Bc4 | King goes to f1 after ...Qh4+, flexible development |
| Falkbeer Countergambit | 2...d5 | Immediate central counterattack |
| Classical Declined | 2...Bc5 | Positional, the bishop stops short castling |
Plans for White
- Build the center with d4. Once Black's e-pawn has left e5, d4 gives White two central pawns and frees the c1-bishop toward f4.
- Win back f4. In most accepted lines White does not stay a pawn down for long: Bxf4, Nc3–e2 or g3 undermine the pawn. Being a pawn down with open lines is fine; being a pawn down with nothing is not.
- Use the f-file. Castle short when it is safe and put a rook on f1 against f7. Bc4 adds pressure to the same square.
- Break with h4 against ...g5. When Black defends f4 with ...g5, h4 attacks the base of the chain and opens the h-file or wins the g4-pawn.
- In the declined lines, play c3 and d4 against ...Bc5, keep the king in the center until the bishop is blunted, and look for f5 or fxe5 with a half-open f-file later.
Plans for Black
- Return the pawn for development. ...d5 (in the Modern or the Falkbeer) is the simplest answer: it opens the bishops and leaves White's king position loose.
- Keep the pawn with a sound structure. ...d6 and ...g5 (Fischer) or ...g5 with ...Bg7 (Kieseritzky) hold f4, and the g7-bishop presses on d4 and b2.
- Use the e1–h4 diagonal. ...Qh4+ against an uncastled king and ...Bc5 against short castling are recurring weapons.
- Hit e4. ...Nf6 and ...d6 or ...d5 attack White's remaining center pawn; in the Kieseritzky Black wins it with ...Nxe4.
- Trade into an endgame when you keep the extra pawn: White's compensation is about piece activity, and it evaporates as pieces leave the board.
Traps to know
3.fxe5?? in the Classical Declined
After 2...Bc5, taking on e5 looks like it wins a pawn. It loses a rook.
Start
White has two legal replies to 3...Qh4+. 4.Ke2 runs into 4...Qxe4#, so 4.g3 is forced, and then 4...Qxe4+ forks the king on e1 and the rook on h1. Stockfish 17.1 at depth 20 scores the position after 4...Qxe4+ at −3.56: White is losing. The rule for both colors in the King's Gambit is the same: the e1–h4 diagonal is open, so before you capture anything, check whether ...Qh4+ follows. Against 2...Bc5, play 3.Nf3 first.
How to play against the King's Gambit
The simplest plan is to take the pawn and give it back on your own terms. Against 3.Nf3, 3...d5 (Modern Defense) frees your game and leaves White without a clear target. If you prefer to keep the pawn, 3...d6 (Fischer) or 3...g5 both lead to positions where the engine prefers Black, but you must know the lines. Against 3.Bc4, ...Nf6 and ...c6 with ...d5 is a solid setup.
If you do not want to study gambit theory at all, decline with 2...Bc5: White gets only a small edge, and if White grabs on e5 at once the Qh4+ trap wins material. Avoid passive moves such as 2...d6, which give White the center for free. Whatever you choose, watch f7 and develop before going pawn-hunting.
Engine verdict
We ran Stockfish 17.1 (lite, single thread) at a fixed depth of 20 on each position. Scores are in pawns from White's point of view; minus means Black is better.
| Position | Evaluation | Engine's best move |
|---|---|---|
| After 2.f4 | −0.48 | 2...exf4 |
| After 2.f4 exf4 3.Nf3 | −0.49 | 3...g5 |
| Kieseritzky after 9.Nd2 | −0.77 | 9...Qe7 |
| Modern Defense after 6...Be7 | +0.09 | 7.d4 |
| Fischer Defense after 6.Ng1 | −0.74 | 6...Qf6 |
| Muzio Gambit after 6.Qxf3 | −1.08 | 6...Qf6 |
| Bishop's Gambit after 4...c6 | −0.30 | 5.d4 |
| Falkbeer after 4...Nf6 | −0.15 | 5.c4 |
| Classical Declined after 4...Nf6 | +0.24 | 5.d4 |
In MultiPV mode, Black's three best replies to 2.f4 were 2...exf4 (−0.48), 2...d5 (−0.37) and 2...Bc5 (−0.13). In plain terms: 2.f4 swings the score from roughly equal to about half a pawn for Black. That is a small, lasting edge for Black, not a refutation. The accepted lines where Black holds the pawn score worst for White; the lines where Black returns it (Modern, Falkbeer) and the declined lines are close to equal.
History
The King's Gambit was the main battleground of open games in the 19th century. The Immortal Game, Adolf Anderssen against Lionel Kieseritzky in London in 1851, began as a Bishop's Gambit, and Kieseritzky gives his name to the 4.h4 g4 5.Ne5 main line. In 1960 Boris Spassky beat Bobby Fischer with the King's Gambit at Mar del Plata; Fischer answered with his 1961 article "A Bust to the King's Gambit", which recommended 3...d6, the line now called the Fischer Defense. In modern elite chess the opening is a rare surprise weapon rather than a main repertoire choice.
Frequently asked questions
Is the King's Gambit refuted?
No. Stockfish 17.1 gives Black about half a pawn after 2.f4 (−0.48 at depth 20), which is an edge, not a forced win. White gets open lines and development for the pawn, and the main lines stay playable for both sides.
Is the King's Gambit good for beginners?
It teaches attacking chess and open lines, but it punishes loose play because White's king is exposed from move two. Learn it once you are comfortable with basic tactics; if you are new, start with the best chess openings for beginners.
What is the best reply to the King's Gambit?
2...exf4 is the engine's top choice, and 3...d5 after 3.Nf3 is the easiest follow-up to learn. If you prefer to decline, 2...Bc5 is solid and sets the 3.fxe5?? Qh4+ trap.
What is the difference between the King's Gambit Accepted and Declined?
Accepted means Black takes with 2...exf4 and White plays a pawn down for development and the f-file. Declined means any other second move, most often 2...Bc5 or 2...d5 (the Falkbeer Countergambit), keeping material level.
What does 2.f4 do in the King's Gambit?
It attacks Black's e5-pawn with a wing pawn. If Black takes, White can play d4 with two center pawns against one and use the half-open f-file against f7.
Drill the six main lines with the trainer at the top of this page, check your own games move by move on the analysis board, and test the gambit against the engine in play chess. For a calmer 1.e4 e5 game, compare the Italian Game, the Ruy Lopez and the Scotch Game; for an f4 break with less risk, try the Vienna Game.