Nimzo-Indian Defense

The Nimzo-Indian Defense (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4) is a highly respected defence to 1.d4. By pinning the knight on c3, Black stops White from playing e4 easily, and is ready to give up the bishop pair to give White doubled c-pawns.

Origins

The first known game with the opening is Englisch–Blackburne, London 1883, but it is named after Aron Nimzowitsch, a leader of the hypermodern school, who introduced it to master chess in the early 20th century. In hypermodern style, Black fights for the centre without occupying it with pawns: by pinning the c3-knight, Black prevents White's e4. It has been played by every world champion since Capablanca, and Svetozar Gligorić and Lajos Portisch made great contributions to the theory and practice of its most common line, 4.e3.

The idea

3...Bb4 controls e4 without a pawn. Black is often happy to play ...Bxc3 and fight against White's bishop pair. In return, White gets doubled c-pawns, and Black blockades them with ...c5, ...d6 and ...e5, or attacks them with ...Ba6 and ...Nc6–a5. White's aims are to keep the bishops, avoid the doubled pawns (with Qc2) or build a big centre with f3 and e4.

Main lines

• Classical Variation 4.Qc2: White recaptures on c3 with the queen, keeping the pawn structure intact, at the cost of time.
• Rubinstein System 4.e3: flexible development, leading to the Normal Variation 4...O-O and the Gligoric System, which leads to the main line with 7.O-O.
• Sämisch Variation 4.a3: White concedes the doubled pawns at once to gain the bishop pair and a powerful centre.
• Leningrad Variation 4.Bg5 and the Kmoch Variation 4.f3, a straightforward attempt to seize control of e4.
• St. Petersburg Variation 4.e3 b6: Black adds a queenside fianchetto.

Strengths and weaknesses

Strengths

• Very sound and flexible: Black can choose solid or sharp setups.
• Creates an imbalance (bishops against knights, doubled pawns) from move four, so Black can play for a win.
• Rich in instructive strategy about pawn structure and blockade.

Weaknesses

• Only possible after 3.Nc3. Many White players go 3.Nf3 or 3.g3 to avoid it, so Black also needs the Queen's Indian, the Bogo-Indian or an answer to the Catalan.
• Giving up the dark-squared bishop requires understanding when the doubled pawns are really weak.
• Positions can be strategically complex, with long manoeuvring phases.

Who should play it

The Nimzo suits strategic players who like concrete imbalances and structures, and it rewards understanding more than memory. It is excellent against White players who rely on a big pawn centre, because the pin undermines it from move three. It is less effective against flexible move orders that avoid Nc3 altogether.

The numbers

On Lichess White wins 48–50% and Black 46–47% below 2200. Above 2200 it is 48% against 44%. In master games over the board White wins 29%, Black 24% and 47% are drawn.