Modern Defense: Two Knights Variation: Plans and Traps

Key ideas for both sides

White

After 4...Nf6, Bg5 and Qd2, as in the top engine line, hit the f6 knight and prepare long castling.
Be2, O-O and a4 give a calm setup that stops ...b5 before it starts.
Against ...a6, Be3, Qd2 and O-O-O lead to a direct attack, as the third engine line shows.
h3 removes the g4 square from Black's bishop and keeps the f3 knight free.

Black

4...Nf6 leads to a Pirc; the engine follows with ...d5, trading the center pawns.
...c6 and ...Bg4 pin the f3 knight and take a defender away from d4.
...a6 and ...b5 start queenside play against long castling.
...e5 is the main central break once ...Nf6 and ...O-O are in.

Plans and pawn structure

If Black plays ...d5 and the center pawns trade, White keeps the d4 pawn with no e-pawns on the board, while Black has no d-pawn. Then the d4 pawn and the open e-file decide the middlegame: White uses Bc4, Qd2 and long castling, and Black puts a knight on d5 and pressures d4 with ...Bg4 and ...Nc6. In slower lines, Black aims for ...e5 or ...c5 while White keeps a small space edge.

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 +0.50: a slight edge for White. Its three top choices for Black:

+0.50 4...Nf6 5.Bg5 d5 6.exd5 Nxd5 7.Bc4
+0.64 4...c6 5.Be2 Nf6 6.O-O O-O 7.a4
+0.73 4...a6 5.Be3 Nf6 6.Qd2 O-O 7.Bd3

Pawns, from White's side.

How it scores on lichess

3,833 rated lichess games reached this position; White scored 53.9%.

under 120055.6%

1200–159952.6%

1600–199953.1%

2000 and up58.5%

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

Where it goes next

Two Knights Variation, Suttles Variation, Tal Gambit4...c6 · rare

How to play against it

As Black, use the pin ...Bg4 when White has not played h3, and keep hitting the d4 pawn. As White, decide early between short castling with a4 and the sharper Be3, Qd2 and long castling plan.

Questions

What are the moves of the Modern Defense: Two Knights Variation?

The Modern Defense: Two Knights Variation starts 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.Nf3. Its ECO code is B06.

Is the Modern Defense: Two Knights Variation good for White?

Stockfish 17.1 rates the position +0.50 at depth 20, which is a slight edge for White. In 3,833 lichess games from our sample, White scored 53.9%. A sensible, flexible system for White players who prefer natural development to sharp theory.

What is the main idea of the Modern Defense: Two Knights Variation?

White develops both knights and keeps pawns on d4 and e4. Black chooses between ...Nf6 Pirc lines, ...c6 setups and ...a6 with ...b5, often using ...Bg4 to pressure d4.

What should Black play next?

The engine's first choice is Nf6, with c6 and a6 close behind. 4...Nf6 develops and transposes to the Pirc, ready for ...O-O or ...d5.

Updated October 2026. Sources and method.

Modern Defense: Two Knights Variation