Anderssen's Opening e5 2.b3 d5 3.c3 Nf6 4.d3 Nc6

Opening Name: Anderssen's Opening e5 2.b3 d5 3.c3 Nf6 4.d3 Nc6

Moves: 1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6

Description: This uncommon opening begins with 1.a3, known as Anderssen's Opening, which is a flexible but somewhat passive first move. White follows up with a queenside fianchetto plan using 2.b3 and 3.c3, supporting the center and preparing to develop the bishop to b2. The move 4.d3 solidifies White's center control but keeps the position closed and restrained. Black responds actively with central pawn moves (e5 and d5) and develops knights to natural squares (Nf6 and Nc6), aiming for quick central presence.

Characteristic: Anderssen's Opening is characterized by its quiet, non-committal first move that avoids standard opening theory and aims for a flexible setup. The sequence 2.b3 and 3.c3 is somewhat unusual and aims at supporting the center from a distance rather than direct occupation.

Attacking or Defensive: For White, this setup is more positional and somewhat defensive, focusing on solid development and control rather than immediate attacks. Black plays more aggressively, challenging the center early with pawn advances and active piece development.

Center Control: White does not directly challenge the center with pawns early on but supports it indirectly with c3 and d3. Black, in contrast, stakes out a strong central presence with pawns on e5 and d5 and knights supporting these squares, thus controlling the center more aggressively.