ECO code: A00
Anderssen's Opening e5 2.g3 d5 3.Bg2 Nf6 arises after the moves 1. a3 e5 2. g3 d5 3. Bg2 Nf6.
This opening is characterized by White's flexible and somewhat unconventional start with 1.a3, often aimed at avoiding mainstream theory and preparing for a fianchetto with g3 and Bg2. The move 1.a3 can also discourage some Black setups, but it does not immediately contest the center.
White’s setup with 2.g3 and 3.Bg2 focuses on controlling the long diagonal and preparing for kingside fianchetto development. However, White does not challenge the center early and allows Black to establish a strong pawn presence with ...e5 and ...d5.
From White’s perspective, this opening is more positional and somewhat defensive initially, aiming for solid development rather than immediate central confrontation. Black, by contrast, can adopt a more active and central approach with the pawn duo ...e5 and ...d5 and rapid development of the knight to f6, putting pressure on the center.
Overall, this opening does not directly attack the center from White’s side early on. Instead, White adopts a hypermodern stance, controlling key squares from a distance and preparing to challenge the center later. Black takes the initiative in the center with pawns and piece activity.
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.