Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan
ECO D02
Move order
1. Nf3 d5 2. g3 c6 3. Bg2 Nf6 4. O-O Bg4 5. d4 e6
Ideas
ECO D covers queen-pawn games and closed structures, including many Gambits and the Queen's Gambit complex. White develops a knight and keeps flexible transpositions into d4 or c4 setups. This entry tracks a longer branch in the opening tree. Use the diagram and SAN list to recognize the tabiya, then try the line against Maia to explore typical plans in practice.