Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation, Main Line

The Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation, Main Line is a chess opening classified under ECO code E42 in the Indian Defences family, where Black responds to 1.d4 with 1...Nf6, including the Nimzo-Indian, Queen's Indian, and King's Indian. It is reached after 7 moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2 cxd4 6. exd4 O-O 7. a3. The resulting position leaves black to move.