English Opening: King's English Variation, Two Knights Variation, Keres Variation

The English Opening: King's English Variation, Two Knights Variation, Keres Variation is a chess opening classified under ECO code A23 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. g3 Bc5 4. Bg2 c6. The resulting position leaves white to move.