Theoria

Opening guide · Repertoire for White

Four knights game: learn the moves and ideas

Learn how to punish opponents who stick to “principled chess” and think everything will go by the book. The Four Knights gives you simple development, clean positions, and plenty of chances to surprise anyone playing on autopilot.

Practise this opening

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Opening positionWhite to move.
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6

Two lines from our repertoire

Follow each line from the starting position. The notes explain the position after the displayed move, including the plan for the next move. These are repertoire examples; your opponent can choose other replies.

Pause at the diagrams to see the idea. The highlighted squares show the last move; the note explains what comes next.

Moves use international algebraic notation: N = knight, B = bishop, R = rook, Q = queen, K = king.

1. Typical King's Attack (1)

  1. 1. e4
  2. 1... e5
    After 1... e5

    We play ♞g1-f3, developing a piece while also attacking ♟e5

  3. 2. Nf3
  4. 2... Nc6
    After 2... Nc6

    We play ♞b1-c3, focusing on knight development, not rushing bishops or central control

  5. 3. Nc3
  6. 3... Nf6
    After 3... Nf6

    Starting position from the "Four Knights Defense." The main move is developing ♝f1-b5 with a plan to castle, but we choose the sneaky ♟a2-a3, preventing ♝f8-b4 and giving room for error

  7. 4. a3
  8. After 4... Bc5White to move.
    At the board4... Bc5
    After 4... Bc5

    Here, Black falls into our trap with the most logical move. We sacrifice the knight — ♞f3xe5, exploiting Black's uncoordinated pieces. The idea is to play ♟d2-d4 and regain the piece while seizing the center for a favorable position

  9. 5. Nxe5
  10. 5... Nxe5
    After 5... Nxe5

    We play ♟d2-d4, skewering Black's pieces

  11. 6. d4
  12. 6... Bxd4
    After 6... Bxd4

    Taking ♝c5xd4 is also imprecise, letting us place the ♛ with tempo in the center + gaining the advantage of the two bishops. We take back the bishop — ♛d1xd4!

  13. 7. Qxd4
  14. 7... Nc6
    After 7... Nc6

    White has several good retreats, but let's go with ♛d4-d3, keeping the option for long castling. Sure, it slightly blocks ♝f1, but we'll develop it with ♝f1-e2

  15. 8. Qd3
  16. After 8... O-OWhite to move.
    At the board8... O-O
    After 8... O-O

    You should understand: White has the two-bishop advantage, central ♟e4, spatial dominance. All signs point to 0-0-0 and preparing an attack on the kingside

  17. 9. Bg5
  18. 9... h6
    After 9... h6

    Of course, don't trade, retreat ♝g5-h4, maintaining pressure on the pin

  19. 10. Bh4
  20. 10... d6
    After 10... d6

    Long castle, putting the ♚ in a safe spot before launching the kingside offensive. White's plan is simple: ♟f2-f4, ♝f1-e2, ♟h2-h3, ♟g2-g4 with ♟g4-g5, using ♟h6 as a hook for the attack

  21. 11. O-O-O
  22. 11... Re8
    After 11... Re8

    We play ♟f2-f4, seizing space and preventing Black's ♞c6-e5 jump

  23. 12. f4
  24. 12... Bg4
    After 12... Bg4

    We play ♝f1-e2, trading off the active ♝g4

  25. 13. Be2
  26. 13... Bxe2
    After 13... Bxe2

    Capture back the bishop — ♛d3xe2, securing ♟g2's path to g4

  27. After 14. Qxe2Black to move.
    At the board14. Qxe2
    After 14. Qxe2

    White's position is close to winning. Just organize the advance ♟g2-g4-g5, using the pin with ♞c3-d5

2. Typical King Attack (2)

  1. 1. e4
  2. 1... e5
    After 1... e5

    We play ♞g1-f3, developing a piece and attacking ♟e5 at the same time

  3. 2. Nf3
  4. 2... Nc6
    After 2... Nc6

    We play ♞b1-c3, focusing on knight development while not rushing to develop bishops and control the center

  5. 3. Nc3
  6. 3... Nf6
    After 3... Nf6

    Starting position of the "Four Knights Defense." The main move is developing ♝f1-b5 with a planned castle, but we choose a very tricky move ♟a2-a3, depriving Black of ♝f8-b4 development, while also inviting a mistake

  7. 4. a3
  8. After 4... Bc5White to move.
    At the board4... Bc5
    After 4... Bc5

    And here, having chosen the most logical move, Black falls into our trap. We sacrifice the knight — ♞f3xe5, taking advantage of the poor position of Black's minor pieces. The idea of the sacrifice is to play ♟d2-d4 and immediately regain the piece by controlling the center, obtaining a favorable position

  9. 5. Nxe5
  10. 5... Nxe5
    After 5... Nxe5

    We play ♟d2-d4, setting Black's pieces up for a fork

  11. 6. d4
  12. 6... Bxd4
    After 6... Bxd4

    The tempting capture ♝c5xd4 also turns out to be inaccurate, allowing us to place the ♛ in the center with tempo + giving White the advantage of two bishops. We take back the bishop — ♛d1xd4!

  13. 7. Qxd4
  14. 7... d6
    After 7... d6

    If Black decides to support ♞e5, we DON'T rush with the attack ♟f2-f4. Such pawn moves "f" at the start are very dangerous as they require proper preparation and usually having the ♚ in a safe place. So we play ♝c1-f4, focusing on development

  15. 8. Bf4
  16. After 8... Nc6White to move.
    At the board8... Nc6
    After 8... Nc6

    We retreat ♛d4-d2, keeping the option for 0-0-0, while connecting the ♛ and ♝ for potential diagonal work

  17. 9. Qd2
  18. 9... O-O
    After 9... O-O

    Let's castle, chess fans!

  19. 10. O-O-O
  20. 10... Re8
    After 10... Re8

    What's the opponent up to? — To take our pawn — ♞f6xe4. For this reason, we reinforce — ♟f2-f3, creating a solid pawn chain

  21. 11. f3
  22. 11... Be6
    After 11... Be6

    What do we have? Opposite-side castling, the advantage of two ♝, and spatial superiority due to the powerful ♟e4. All these arguments tip the scale in favor of a ♟ attack on the kingside. We play ♟g2-g4, grabbing space, slowly "suffocating Black"

  23. 12. g4
  24. 12... a6
    After 12... a6

    In case of Black's clearly slow advance on the opposite flank — we play ♟h2-h4, continuing to pursue our strategy

  25. 13. h4
  26. 13... b5
    After 13... b5

    What do we do: ♟h4-h5 or the neat attack ♟g4-g5? We want to first take away the h5 square from ♞f6 to prevent it from blocking our pawns. We play ♟h4-h5, with ♟g4-g5 in mind for the next move!

  27. After 14. h5Black to move.
    At the board14. h5
    After 14. h5

    White has a significant advantage and serious grounds to play for a win!

Original commentary from Theoria’s opening lessons, prepared by FIDE Master Maksims Golubovskis.

Put the idea on the board

Open this opening in the trainer to study and practise its lines. Start with one line, explain the purpose of each move, then try to recall it without hints.

Your opening, explained by a master.

FIDE Master and the chess educator behind MaxounChess, Max prepares Theoria’s opening lessons to help you understand the plan and make your next move with purpose.

FMMaksims Golubovskis

Max has loved chess since childhood and wants to share that passion. For him, the game teaches more than moves: clear decisions under pressure, patience when plans fall apart, and the self-control to tackle problems calmly, on and off the board.