Two Knights: 4.Ng5 d5 5.exd5 Nxd5

Before the first move

The Two Knights Defense is a sharp, tactical battle where White tries to exploit the f7-square early. In this line, Black allows the Knight Attack, leading to the infamous Fried Liver Attack. Both sides must be precise, as one slip can lead to an immediate collapse in this high-voltage tactical duel.

1. e4White · your move

Push your pawn to e4. This move claims the center and opens diagonals for your queen and light-squared bishop. It is the most popular way to start the game, aiming for active piece play and controlling key central squares from the very first move.

1... e5Black

Black replies e5, establishing a symmetrical pawn structure. This is the most traditional response, though players often explore the French Defense with e6 or the Scandinavian Defense with d5 to avoid the main-line theoretical battles that follow this move.

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 the most natural developing move, attacking the e5-pawn and preparing to castle kingside. You are putting immediate pressure on Black's center while bringing a minor piece toward the middle of the board.

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 common and solid defense of the e5-pawn. Alternatives like the Petrov Defense with Nf6 or the Philidor Defense with d6 are also popular, but Nc6 keeps the game in classical territory, supporting the center directly.

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. Bc4White · your move

Move your bishop to c4. This develops your light-squared bishop to its most active post, eyeing the vulnerable f7-pawn. You are now ready to castle kingside and have established the Italian Game, one of the oldest and most respected openings in chess.

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, the signature move of the Two Knights Defense. Instead of the calm Bc5, Black counterattacks the e4-pawn immediately. This invites White to try the aggressive Ng5, though solid players often prefer d3 or O-O to maintain a steady advantage.

Other paths here: h6 (Italian Game: Anti-Fried Liver Defense) · Nd4 (Italian Game: Blackburne-Kostić Gambit) · Bc5 (Italian Game: Giuoco Piano) · Be7 (Italian Game: Hungarian Defense)

4. Ng5White · your move

Slide your knight to g5. This creates an immediate double attack on the f7-pawn, coordinated with your bishop on c4. You are forcing Black to find a precise solution to the threat of a fork on f7, leading into the heart of the Knight Attack.

Other paths here: Nc3 (Four Knights Game: Italian Variation) · d3 (Italian Game: Two Knights Defense, Modern Bishop's Opening) · d4 (Italian Game: Two Knights Defense, Open Variation) · O-O (Two Knights Defence)

4... d5Black

Black replies d5, the standard way to blunt the pressure on f7. White is almost forced to capture this pawn. If Black tries to ignore the threat or plays the speculative Traxler, the game becomes a tactical minefield where White often holds the upper hand.

Other paths here: Nxe4 (Italian Game: Two Knights Defense, Ponziani-Steinitz Gambit) · Bc5 (Italian Game: Two Knights Defense, Traxler Counterattack) · Nd5 (Two Knights Defence)

5. exd5White · your move

Capture the pawn on d5. This maintains the pressure and forces Black to decide how to recover the material. By opening the e-file, you create new tactical possibilities while keeping your pieces aimed at the enemy king's position.

5... Nxd5Black

Black plays Nxd5, entering the notorious Fried Liver Attack. This move is very risky because it allows White to sacrifice on f7. Modern theory often prefers the Polerio Defense with Na5 or the Fritz Variation with Nd4 to avoid this specific tactical nightmare.

Other paths here: Nd4 (Italian Game: Two Knights Defense, Fritz Variation) · Nb4 (Italian Game: Two Knights Defense, Kloss Gambit) · b5 (Italian Game: Two Knights Defense, Ulvestad Variation) · Na5 (Italian Game: Two Knights Defense, Polerio Defense)

Where you stand

The position has reached a fever pitch. White is prepared to sacrifice the knight on f7 to pull the Black king into the center. If White plays Nxf7, Black must be ready for a long, difficult defense. Both sides have reached a point where tactical calculation is more important than general principles.

• g5-f7 Sacrifice the knight to expose the king
• d1-f3 Bring the queen out to pressure d5
• e8-e6 The king must walk forward to defend
• c6-b4 Counterattack the c2-pawn with the knight