ECO code: A00
Grob Opening: Keene Defense 4.d4
Moves: 1. g4 d5 2. h3 e5 3. Bg2 c6 4. d4
This variation of the Grob Opening, known as the Keene Defense, is characterized by White's early flank pawn pushes (g4 and h3) combined with a timely central strike with 4.d4. The move 4.d4 is White's attempt to challenge Black's strong pawn presence in the center and to open lines for rapid development.
Playing 4.d4 here shifts the game from purely flank-based play to a more direct confrontation in the center. This move is attacking in nature for White, as it seeks to contest Black's control of central squares and create dynamic play. For Black, the approach is initially defensive, aiming to maintain a solid pawn structure while responding to White’s unconventional flank advances.
Overall, this opening does involve an attack on the center by White, especially from move 4 onwards. While the first three moves focus on flank operations, 4.d4 signals White’s intention to fight actively for central space and challenge Black's pawn formation directly.
This opening is defined by the position shown on the board below. The moves displayed are a typical sequence that leads to it, but different sequences can reach the same position and still carry the same opening name.