Kangaroo Defense: Keres Defense, Transpositional Variation

The Kangaroo Defense: Keres Defense, Transpositional Variation is a chess opening classified under ECO code A40 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. d4 e6 2. c4 Bb4+ 3. Nc3. The resulting position leaves black to move.