Nimzo-Indian Defense: Romanishin Variation

An entry in the Encyclopedia of Chess Openings (ECO E20), reached after 7 half-moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. g3.

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4…c5 1 line
- E20 English Hybrid

About this opening

Nimzo-Indian Defense: Romanishin Variation is an opening in the Encyclopedia of Chess Openings, classified under code E20. ECO group E (E00–E99) covers Indian defences against 1.d4, covering the Nimzo-Indian, Queen's Indian, King's Indian and Catalan systems. This particular variation is reached after 7 half-moves from the starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. g3.

It belongs to the Nimzo-Indian Defense family. Within that family this is a sub-variation (the Romanishin Variation line).

The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nc3 Bb4, 4.g3. From this position exactly one named continuation is recorded in the encyclopaedia.