E00-E99

The Leningrad Variation. White plays Bg5 to pin the knight early, leading to very sharp and atypical Nimzo-Indian positions.

The main line of the Leningrad Variation. A highly tactical battle where White gains space and Black seeks counterplay through piece activity.

The Classical (Capablanca) Variation. White plays 4.Qc2 to avoid doubled pawns. It is the most popular and solid way to handle the Nimzo-Indian.

The Classical Variation with 4...Nc6. Black uses piece pressure against d4, leading to dynamic play and quick development.

The Classical Variation with 4...d5. A very solid and reliable defense for Black, transposing into structures similar to the Queen's Gambit.

The main theoretical battleground of the Classical 4...d5. White maintains a slight edge through superior piece coordination.

The Classical Variation with 4...O-O. Black prioritizes king safety before deciding on the final central counter-strike.

Sharp theoretical lines in the Classical O-O variation. Both sides follow long computer-analyzed paths to maintain a dynamic balance.

The Classical Variation with 4...c5. Black challenges the center immediately, leading to open positions with active piece play for both sides.

Refinements of the 4...c5 Classical Variation. White seeks a space advantage while Black utilizes the semi-open c-file.