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The Taimanov Variation of the Nimzo. White plays e3 and Bd3 to build a classical center while ignoring the pin on c3.

The Hubner Variation. Black aims to close the center and exploit White's doubled pawns through slow, maneuvering positional play.

The main line of the Hubner Variation. A deep strategic struggle where Black's dark-square control is the defining feature.

The Nimzo-Indian with 4.e3 b6. Black prepares a double fianchetto to control the center, leading to rich and complex middle-games.

The Fischer Variation (4.e3 O-O 5.Ne2). White avoids the doubled pawns by developing the knight to e2, leading to a slow positional game.

Refinements of the Fischer Variation. White aims for the bishop pair while Black focuses on rapid development and central pressure.

The main line of the 4.e3 Nimzo-Indian. It is the most flexible and widely played branch of the Nimzo at the professional level.

The 4.e3 Nimzo with early Bd3. White builds a traditional attacking setup while Black organizes a flexible defense.

Modern refinements of the 4.e3 Nimzo. Both sides focus on subtle piece improvements and the timing of central pawn breaks.

The final theoretical extension of the 4.e3 Nimzo-Indian. It represents a total mastery of classical development and central control.