Chess Openings Lab
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King's Gambit Declined: Miles Defense

The Miles Defense is 2...Nc6 3.Nf3 f5, where Black answers the King's Gambit with a countergambit on the f-file. Black opens lines toward White's king and hopes for quick piece play, while White aims for 4.exf5 and a d4 center.

Moves
1.e4 e5 2.f4 Nc6 3.Nf3 f5
ECO
C30
Engine
+0.34 · a slight edge for White (Stockfish 17.1, depth 20)
Played
294 games in our lichess sample
White scores
46.8%

Key ideas for both sides

White

  • 4.exf5 is the engine's choice; after ...exf4, play d4 and Bd3 to hold the center.
  • Castle short and line up the rook on f1 against Black's open kingside.
  • 4.d3 and 4.Nc3 are calmer moves that keep a small, safe edge.
  • Be ready for ...Qf6 and ...Bd6: they gang up on f4 and d4.

Black

  • After 4.exf5, take with ...exf4, then strike with ...d5 to gain central space.
  • Develop ...Bd6 and ...Qf6 to support the f4 pawn and hit d4.
  • Against 4.Nc3, the ...fxe4 capture and ...Nf6 open lines with quick piece play.
  • Keep the king safe: both f-files are now half-open or open after the trades.

Plans and pawn structure

After 4.exf5 exf4 5.d4 d5, the structure is symmetrical, with d4 against d5 and an open e-file. White plays Bd3 and O-O, and tries to win back f4. Black develops with ...Bd6, ...Qf6 and ...Nge7, and tries to keep the extra pawn. The e-file and the weak e5 and e4 squares decide the middlegame. Whoever controls the e-file with a rook gets the better chances.

Where the engine's main line heads: Symmetrical center: d4 against d5, open e-file. A symmetrical center: d4 against d5 with an open e-file. Neither side has pawn weaknesses, so piece activity decides.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position +0.34: a slight edge for White. Its three top choices for White:

  1. +0.34 4.exf5 exf4 5.d4 d5 6.Bd3 Bd6
  2. +0.24 4.d3 d6 5.Nc3 Nf6 6.Be2 Be7
  3. +0.18 4.Nc3 fxe4 5.Nxe5 Nf6 6.d3 exd3

Pawns, from White's side.

How it scores on lichess

294 rated lichess games reached this position; White scored 46.8%.

1200–159950.9%
1600–199947.8%
2000 and up38.8%

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

How to play against it

As White, play 4.exf5 and d4, then Bd3 and O-O. Do not let Black castle long in peace; open the e-file quickly. Keep an eye on the f4 pawn and win it back once your pieces are out, ideally with the c1 bishop.

Questions

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

The King's Gambit Declined: Miles Defense starts 1.e4 e5 2.f4 Nc6 3.Nf3 f5. Its ECO code is C30.

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

Stockfish 17.1 rates the position +0.34 at depth 20, which is a slight edge for White. In 294 lichess games from our sample, White scored 46.8%. An aggressive sideline for Black players who want to surprise, but White gets a comfortable game with simple development.

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

Black meets the King's Gambit with ...Nc6 and ...f5, opening lines on the f-file. White takes on f5, plays d4 and gets a symmetrical center with an open e-file.

What should White play next?

The engine's first choice is exf5, with d3 and Nc3 close behind. 4.exf5 takes the pawn and prepares d4, leading to a symmetrical center with an open e-file.

Updated October 2026. Sources and method.