Nimzo-Indian: 4.e3 O-O 5.Nf3 Ne4

Before the first move

The Nimzo-Indian Defense is a sophisticated hypermodern opening where Black pins the White knight to prevent e4 and control the center with pieces. In this specific line, Black chooses a very active approach by leaping into e4 early, challenging White to resolve the tension around the pinned c3-knight immediately.

1. d4White · your move

Push your pawn to d4. This move claims central space, opens a path for your queen's bishop, and establishes a presence in the heart of the board from the very first move.

1... Nf6Black

Black responds with Nf6, the most popular and flexible reply. While alternatives like d5 or the sharp Englund Gambit exist, this move focuses on controlling the center while preparing for future development.

Other paths here: Na6 (Australian Defense) · g5 (Borg Defense: Borg Gambit) · b6 (English Defense) · e5 (Englund Gambit)

2. c4White · your move

Advance your pawn to c4. By doing this, you exert more pressure on the d5-square and prepare to develop your knight behind the pawn, a hallmark of queen's pawn openings.

Other paths here: f4 (Canard Opening) · g4 (Indian Defense: Gibbins-Weidenhagen Gambit) · e4 (Indian Defense: Omega Gambit) · d5 (Indian Defense: Pawn Push Variation)

2... e6Black

Black plays e6, preparing to challenge the center. This move often leads to the Queen's Gambit Declined or the Nimzo-Indian. Other options include g6 for a King's Indian or b6 for the Queen's Indian.

Other paths here: g5 (Indian Defense: Medusa Gambit) · b5 (Indian Defense: Pyrenees Gambit) · a6 (Indian: 2.c4 a6) · Nc6 (Mexican Defense)

3. Nc3White · your move

Develop your knight to c3. This is the most ambitious square for the knight, directly supporting a future e4 push and putting pressure on the d5 and e4 squares.

Other paths here: g3 (Catalan Opening) · Qb3 (Indian Defense) · g4 (Indian Defense: Devin Gambit) · Bg5 (Indian Defense: Seirawan Attack)

3... Bb4Black

Black replies with Bb4, entering the Nimzo-Indian Defense. By pinning the knight, you've temporarily stopped White's plan of playing e4. Alternatives like d5 or c5 would transition into different classical structures.

Other paths here: b6 (Queen's Pawn: Neo-Indian, 3...b6) · c5 (Queen's Pawn: Neo-Indian, 3...c5) · d5 (Queen's Gambit Declined: Exchange Variation)

4. e3White · your move

Push your pawn to e3. This solidifies your center and prepares to develop your kingside pieces. It is the Rubinstein System, one of the most reliable ways to meet the Nimzo-Indian.

Other paths here: f3 (Nimzo-Indian Defense: Kmoch Variation) · Qd3 (Nimzo-Indian Defense: Mikenas Attack) · g3 (Nimzo-Indian Defense: Romanishin Variation) · Bd2 (Nimzo-Indian: 4.Bd2)

4... O-OBlack

Black castles, prioritizing king safety. This is the main line, though Black can also strike the center immediately with c5 or d5, or prepare a queenside fianchetto with the move b6.

Other paths here: Nc6 (Nimzo-Indian Defense: Rubinstein System, Taimanov Variation) · c5 (Nimzo-Indian Defense: Rubinstein System) · b6 (Nimzo-Indian Defense: St. Petersburg Variation) · d5 (Keres Variation, Nimzo-Indian)

5. Nf3White · your move

Bring your knight to f3. This natural developing move controls the center and prepares for your own kingside castling, while keeping your options open for how to handle the pin.

Other paths here: Ne2 (Nimzo-Indian Defense: Reshevsky Variation) · Bd3 (Nimzo-Indian Defense: Normal Variation) · a3 (Nimzo-Indian Defense: Sämisch Variation)

5... Ne4Black

Black plays the provocative Ne4. Instead of the more common b6 or d5, this move immediately tests White's setup. White must now decide whether to defend the knight or allow their pawn structure to be damaged.

Other paths here: b6 (Nimzo-Indian: 4.e3 O-O 5.Nf3 b6) · c5 (Nimzo-Indian: 4.e3 O-O 5.Nf3 c5) · d5 (Nimzo-Indian Defense: Normal Variation, Ragozin Variation)

Where you stand

The position is strategically rich. White must decide how to handle the pressure on c3, often playing Qc2 to defend the knight. Black will likely support the e4-knight with f5, creating a 'Dutch-like' structure. Both sides have chances: White seeks the bishop pair and a strong center, while Black aims for piece activity and pressure against the doubled c-pawns.

• d1-c2 Queen defends the pinned knight on c3
• f7-f5 Support the central knight and gain space
• f1-d3 Develop bishop to challenge the e4 knight
• b4-c3 Trade bishop for knight to damage pawns