ECO code: A00
Opening Name: Anderssen's Opening with e5 (1.a3 e5)
Moves: 1. a3 e5 2. g3 d5 3. Bg2 Nf6 4. d3 Nc6 5. Nd2 Bd6 6. e3 O-O
FEN: r1bq1rk1/ppp2ppp/2nb1n2/3pp3/8/P2PP1P1/1PPN1PBP/R1BQK1NR w KQ - 1 7
Characteristic of the opening: Anderssen's Opening (1.a3) is an unconventional and flexible start that aims to avoid mainstream theory and provoke Black's intentions. The early a3 move prepares for expansion on the queenside or prevents Black's pieces from occupying b4. With the follow-up g3 and Bg2, White fianchettoes the bishop, emphasizing long-term control over the central and light squares.
Center control: This line adopts a somewhat restrained approach to the center. White does not immediately contest the center aggressively but supports it solidly with d3 and e3, focusing on a flexible and positional buildup rather than direct confrontation. Black, by contrast, stakes a strong claim in the center with e5 and d5.
Attacking or defensive nature: As White, this setup is more positional and somewhat defensive, aiming to develop harmoniously and prepare for a gradual central or flank expansion. Black's play is more directly attacking in the center with pawns on e5 and d5 and active piece development. White's plan usually involves careful maneuvering rather than immediate attacks.
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.