English Opening: Four Knights System, Nimzowitsch Variation

The English Opening: Four Knights System, Nimzowitsch Variation is a chess opening classified under ECO code A28 in the Flank Openings family, characterized by moves like 1.c4, 1.Nf3, or 1.f4, aiming to control the center indirectly. It is reached after 4 moves: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e4. The resulting position leaves black to move.