English Opening: Agincourt Defense, Tarrasch Defense

The English Opening: Agincourt Defense, Tarrasch Defense is a chess opening classified under ECO code A13 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 6 moves: 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 c5 5. b3 Nc6 6. O-O Be7. The resulting position leaves white to move.