Chess Openings Lab
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French Defense: Carlson Gambit

The Carlson Gambit is 3.Nf3 dxe4 4.Ne5 in the French, where White lets the e4 pawn go and jumps the knight to e5 instead of retreating. White hopes for Qh5 tricks against f7, but Black stays a pawn up with ...Nd7, ...g6 and ...c5.

Moves
1.e4 e6 2.d4 d5 3.Nf3 dxe4 4.Ne5
ECO
C00
Engine
−0.99 · a clear edge for Black (Stockfish 17.1, depth 20)
Played
283 games in our lichess sample
White scores
42.8%

Key ideas for both sides

White

  • Qh5 hits f7 together with the e5-knight. Against 4...Nd7, 5.Qh5 is met by 5...g6, which blocks the queen.
  • Win back e4 with Qe2 or Qh4 followed by Qxe4, as both main engine lines show.
  • Against 4...Nf6, develop with 5.Nc3, Bc4 and O-O and hope the lead in development counts.

Black

  • 4...Nd7 challenges the e5-knight at once; meet 5.Qh5 with 5...g6, then 6...c5 hits d4.
  • Even when White wins e4 back, ...Ngf6 and ...Bg7 give Black fast, harmonious development.
  • 4...Ne7 is also good: the knight covers f5 and g6, and ...g6 with ...Bg7 can follow.

Plans and pawn structure

Because White's e-pawn is gone, the structure is White's d4 against Black's e6, with an open position. White's queen spends many moves: Qh5, Qe2 or Qh4, then Qxe4. Black uses that time for ...Nd7, ...Ngf6 and ...c5 against d4, often with the bishop on g7. If White regains e4, Black still has the better development and pressure on d4. If White never regains it, Black is simply a healthy pawn up.

Where the engine's main line heads: White pawn d4, no e-pawns for White, no d-pawn for Black. White has a pawn on d4 and no e-pawn; Black has no d-pawn. White has more central space; Black's pieces are free and the d4 pawn is a target.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position −0.99: a clear edge for Black. Its three top choices for Black:

  1. −0.99 4...Nd7 5.Qh5 g6 6.Qe2 c5 7.Qxe4
  2. −0.96 4...Ne7 5.Qh5 g6 6.Qh4 Bg7 7.Qxe4
  3. −0.88 4...Nf6 5.Nc3 Bb4 6.Bc4 O-O 7.O-O

Pawns, from White's side.

How it scores on lichess

283 rated lichess games reached this position; White scored 42.8%.

under 120043.7%
1200–159948.3%
1600–199935.2%

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

How to play against it

Keep the pawn as long as it is safe. Play 4...Nd7 or 4...Ne7, answer Qh5 with ...g6, and strike with ...c5 once White's queen wanders. Never leave f7 guarded only by the king while the queen and e5-knight both aim at it.

Questions

What are the moves of the French Defense: Carlson Gambit?

The French Defense: Carlson Gambit starts 1.e4 e6 2.d4 d5 3.Nf3 dxe4 4.Ne5. Its ECO code is C00.

Is the French Defense: Carlson Gambit good for White?

Stockfish 17.1 rates the position −0.99 at depth 20, which is a clear edge for Black. In 283 lichess games from our sample, White scored 42.8%. An unsound gambit that relies on cheap threats; Black just needs to watch f7 and develop.

What is the main idea of the French Defense: Carlson Gambit?

White gives the e4 pawn and uses Ne5 with Qh5 to create threats against f7. Black blocks with ...g6, develops with ...Nd7 and ...c5, and is better because White's queen wastes time.

What should Black play next?

The engine's first choice is Nd7, with Ne7 and Nf6 close behind. 4...Nd7 challenges the e5-knight right away, and ...g6 handles the Qh5 threat.

Updated October 2026. Sources and method.