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.

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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.Bc4

    Develops the bishop onto an active diagonal aimed at f7.

    Idea: Accelerate kingside development and make Black’s weakest early square a target.

  6. 3Bc5

    Develops the bishop to c5, bringing it into the game.

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

  7. 4.b4

    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.

  8. 4Bxb4

    Captures the pawn on b4 and changes the local pawn or piece balance.

    Idea: Remove an active defender and improve the moving piece’s influence.

  9. 5.c3

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

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

  10. 5Ba5

    Repositions the bishop to a5, where it influences a new part of the board.

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

  11. 6.d4

    Advances to d4 to claim central space and control nearby key squares.

    Idea: Give the pieces room to develop behind a durable central foothold.

  12. 6exd4

    Captures the pawn on d4 and changes the local pawn or piece balance.

    Idea: Open lines in the center and reshape the center for the next phase.

  13. 7.O-O

    Tucks the king away and activates the rook in a single move.

    Idea: Finish kingside development so the central pieces can coordinate safely.

  14. 7dxc3

    Captures the pawn on c3 and changes the local pawn or piece balance.

    Idea: Open lines in the queenside and reshape the center for the next phase.

  15. 8.Qb3

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

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

  16. 8Qf6

    Repositions the queen to f6, where it influences a new part of the board.

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

  17. 9.e5

    Advances to e5 to claim central space and control nearby key squares.

    Idea: Give the pieces room to develop behind a durable central foothold.

  18. 9Qg6

    Repositions the queen to g6, where it influences a new part of the board.

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

  19. 10.Nxc3

    Captures the pawn on c3 and changes the local pawn or piece balance.

    Idea: Remove an active defender and improve the moving piece’s influence.

  20. 10Nge7

    Develops the knight to e7, bringing it into the game.

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

  21. 11.Ba3

    Develops the bishop to a3, bringing it into the game.

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

Book continuations

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0 moves
This is the end of the indexed line.

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.