English Opening: Anglo-Indian Defense, Slav Formation

The English Opening: Anglo-Indian Defense, Slav Formation is a chess opening classified under ECO code A15 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 3 moves: 1. c4 Nf6 2. Nf3 g6 3. g3 c6. The resulting position leaves white to move.