Chess Openings Lab
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King's Gambit Declined: Queen's Knight Defense

The Queen's Knight Defense is 2...Nc6, where Black develops instead of taking on f4. Black keeps the option of ...exf4 later and supports e5, while White chooses between 3.Nf3, 3.Nc3 and 3.d3 to build a center.

Moves
1.e4 e5 2.f4 Nc6
ECO
C30
Engine
+0.17 · level (Stockfish 17.1, depth 20)
Played
10,717 games in our lichess sample
White scores
52.7%

Key ideas for both sides

White

  • 3.Nf3 is the engine's choice; after ...exf4, d4 and d5 hit the c6 knight.
  • 3.Nc3 develops and protects e4, but allows ...Qh4+ and a king walk after d4.
  • 3.d3 is calm: it meets ...exf4 with Bxf4 and quick development of the kingside.
  • Keep watch over the h4-e1 diagonal before you open the center with d4.

Black

  • Take on f4 after Nf3 and answer d4 with ...g5, setting up ...g4.
  • Against 3.Nc3, ...exf4 and ...Qh4+ after d4 force White's king to move.
  • The ...f5 thrust after Nf3 is the Miles Defense, a risky countergambit.
  • Develop ...Nf6 and ...Bc5 if White plays slowly with d3, aiming at g1.

Plans and pawn structure

The c6 knight supports e5 and keeps ...exf4 in reserve. In the main line, White's d4-d5 and Black's ...g5-g4 lead to sharp play where knights fall on both sides. In quieter lines, the game looks like a regular open game with ...Nf6 and ...Bc5. White tries to win back f4 and castle; Black tries to keep the pawn and open lines toward White's king.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position +0.17: level. Its three top choices for White:

  1. +0.17 3.Nf3 exf4 4.d4 g5 5.d5 g4
  2. −0.25 3.Nc3 exf4 4.d4 Qh4+ 5.Ke2 Qh5+
  3. −0.37 3.d3 exf4 4.Bxf4 d5 5.exd5 Qxd5

Pawns, from White's side.

How it scores on lichess

10,717 rated lichess games reached this position; White scored 52.7%.

under 120050.9%
1200–159954.4%
1600–199952.3%
2000 and up47.5%

Light: White wins. Grey: draws. Dark: Black wins. About the sample.

Where it goes next

  • Miles Defense3.Nf3 · 294 games
  • Hobbs-Zilbermints Gambit3.Nf3 · rare

How to play against it

As White, 3.Nf3 is best. Be ready for ...exf4 and play d4 and d5 to chase the knight. Do not let Black set up ...g5 and ...Bg7 in peace. Keep your king's diagonal covered before playing Nc3 and d4 together.

Questions

What are the moves of the King's Gambit Declined: Queen's Knight Defense?

The King's Gambit Declined: Queen's Knight Defense starts 1.e4 e5 2.f4 Nc6. Its ECO code is C30.

Is the King's Gambit Declined: Queen's Knight Defense good for Black?

Stockfish 17.1 rates the position +0.17 at depth 20, which is level. In 10,717 lichess games from our sample, White scored 52.7%. A flexible choice for Black players who want to keep options; White needs to know the sharp d4-d5 line.

What is the main idea of the King's Gambit Declined: Queen's Knight Defense?

Black develops ...Nc6 and waits to see White's plan before taking on f4. After 3.Nf3 exf4 4.d4, the game turns tactical with d5 and ...g5-g4.

What should White play next?

The engine's first choice is Nf3, with Nc3 and d3 close behind. 3.Nf3 develops and prepares d4, the clearest way to meet the knight move.

Updated October 2026. Sources and method.