Open games & French

King's Knight Opening

1.e4 e5 2.Nf3

The King's Knight Opening starts with 1.e4 e5 2.Nf3 and is catalogued under ECO C40, in the open games & french half of the book. The catalog indexes 3 lines inside it, grouped into 3 named variations, and the position after those moves has 1 playable continuation to walk from here.

Opening repertoire map

Root edges show how often each move is played around your Elo. Use the arrow on a position to reveal the next replies.

Current position
Ruy Lopez: Morphy Defense, Wormald Attack
Popularity by Elo
Share of Lichess blitz, rapid, and classical games that continued with each move.
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Current setup

Move ideas

  1. 1.e4

    Claims the center with a pawn and opens lines for the queen and king’s bishop.

    Idea: Build quick development and make early castling possible.

  2. 1e5

    Meets White’s center directly and opens lines for Black’s queen and bishop.

    Idea: Fight for equal central space in a balanced, open position.

  3. 2.Nf3

    Develops the king’s knight and attacks Black’s e5-pawn.

    Idea: Increase central pressure while getting ready to castle.

  4. 2Nc6

    Defends e5 while developing the queen’s knight toward the center.

    Idea: Hold the central pawn and keep several classical setups available.

  5. 3.Bb5

    Develops the bishop and pressures the knight that helps defend e5.

    Idea: Create long-term pressure on Black’s center before deciding whether to exchange.

  6. 3a6

    Advances the a-pawn to gain queenside edge space and control new squares.

    Idea: Create useful wing space while keeping the central structure flexible.

  7. 4.Ba4

    Repositions the bishop to a4, where it influences a new part of the board.

    Idea: Improve the piece’s activity and support the next stage of the plan.

  8. 4Nf6

    Develops the knight to f6, bringing it into the game.

    Idea: Improve piece coordination and clear the back rank for castling and the rooks.

  9. 5.Qe2

    Repositions the queen to e2, where it influences a new part of the board.

    Idea: Coordinate threats carefully while avoiding unnecessary tempi against the queen.

  10. 5b5

    Advances the b-pawn to gain queenside space and control new squares.

    Idea: Prepare a fianchetto or discourage the opponent’s expansion on that wing.

  11. 6.Bb3

    Repositions the bishop to b3, where it influences a new part of the board.

    Idea: Improve the piece’s activity and support the next stage of the plan.

Book continuations

Waiting for Lichess game popularity.

1 move

Named variations

Each line below is an indexed entry under King's Knight Opening. Open one to load it on the board and keep exploring from that position.

ECO groups openings by the structures they lead to, so these families tend to share plans with the King's Knight Opening.