Nimzo-Indian Defense: St. Petersburg Variation, with Ne4

The Nimzo-Indian Defense: St. Petersburg Variation, with Ne4 is a chess opening classified under ECO code E43 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 6 moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 Ne4. The resulting position leaves white to move.