English Opening: Agincourt Defense, Keres Defense

The English Opening: Agincourt Defense, Keres Defense is a chess opening classified under ECO code A14 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 7 moves: 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Be7 5. O-O c5 6. cxd5 Nxd5 7. Nc3 Nc6. The resulting position leaves white to move.