Four Knights: 4.Bb5 Bb4 5.O-O

Before the first move

The Four Knights Game is one of the most solid and symmetrical openings in chess. By developing all four knights early, both sides aim for a balanced struggle where central control and piece activity take precedence over quick tactical shots. It is a perfect choice for players who value fundamental principles and clear plans.

1. e4White · your move

Push your pawn to e4. This classic opening move claims a stake in the center and immediately clears the path for your light-squared bishop and queen to enter the game.

1... e5Black

Black replies with e5, the most principled response. While alternatives like the Sicilian Defense (c5) or the French Defense (e6) are common, this leads to open games. Rare options like the Barnes Defense (f6) or Borg Defense (g5) are much riskier.

Other paths here: f6 (Barnes Defense) · g5 (Borg Defense) · h6 (Carr Defense) · f5 (Duras Gambit)

2. Nf3White · your move

Develop your knight to f3. This is an active developing move that puts immediate pressure on Black's e5-pawn while preparing for kingside castling later in the game.

Other paths here: Ke2 (Bongcloud Attack) · d4 (Center Game) · c4 (English Opening: The Whale) · Ne2 (King's Pawn Game: Alapin Opening)

2... Nc6Black

Black plays Nc6, the most solid defense. While the Petroff Defense (Nf6) is a major alternative, this move keeps the game in classical lines. Sharp gambits like the Elephant (d5) or Damiano (f6) are generally considered inferior.

Other paths here: d5 (Elephant Gambit) · Qe7 (Gunderam Defense) · Bc5 (King's Pawn Game: Busch-Gass Gambit) · f6 (King's Pawn Game: Damiano Defense)

3. Nc3White · your move

Develop your other knight to c3. This completes the development of your knights and reinforces your control over the d5 and e4 squares, signaling a very solid setup.

Other paths here: Nxe5 (Irish Gambit) · g3 (King's Knight Opening: Konstantinopolsky) · c4 (King's Pawn Game: Dresden Opening) · b4 (King's Pawn Game: Pachman Wing Gambit)

3... Nf6Black

Black plays Nf6, maintaining the symmetry. This is the main line, though Black can try the Three Knights Variation with Bb4 or the Steinitz Defense with g6 if they wish to break the pattern early.

Other paths here: Bb4 (Three Knights Opening) · g6 (Three Knights Opening: Steinitz Defense) · f5 (Three Knights Opening: Winawer Defense) · Bc5 (Three Knights: 3...Bc5)

4. Bb5White · your move

Slide your bishop to b5. This applies pressure to the knight on c6, which is the key defender of the e5-pawn. You are now threatening to create imbalances in the center.

Other paths here: a3 (Four Knights Game: Gunsberg Variation) · Nxe5 (Four Knights Game: Halloween Gambit) · d4 (Four Knights Game: Scotch Variation) · g3 (Four Knights Game: Glek System)

4... Bb4Black

Black replies with Bb4, continuing the symmetrical battle. Black could also choose the Rubinstein Variation (Nd4) to complicate matters or the Classical Variation (Bc5), but this move is the most solid.

Other paths here: Bc5 (Four Knights Game: Spanish Variation, Classical Variation) · Nd4 (Four Knights Game: Spanish Variation, Rubinstein Variation) · d6 (Four Knights: Spanish, 4...d6) · a6 (Four Knights Game: Spanish Variation, Ranken Variation)

5. O-OWhite · your move

Castle kingside to bring your king to safety and activate your rook. This is a crucial step before the central tension finally breaks and the pieces begin to trade.

Where you stand

The position is perfectly symmetrical and rich in strategic depth. Both sides will likely castle and then look to challenge the center with d3 or d4. Watch for the moment when the bishops are traded for knights, as this will determine the pawn structure and the long-term plans for both players in the middlegame.

• e8-g8 Black castles to secure the king.
• d2-d3 White solidifies the center with d3.
• b4-c3 Black may trade the bishop for the knight.
• c3-e2 White knight maneuvers toward the kingside.