Reti: Advance, 3.g3 c5 4.Bg2

Opening Name: Reti: Advance, 3.g3 c5 4.Bg2

Moves: 1. Nf3 d5 2. c4 d4 3. g3 c5 4. Bg2

Description: This variation of the Reti Opening features an early c4 push by White, attacking Black's central presence, followed by a fianchetto of the kingside bishop with 3.g3 and 4.Bg2. The characteristic move 3.g3 signals White’s intention to control the long diagonal and maintain flexibility in the center rather than immediately occupying it with pawns. Black responds actively with 3...c5, challenging White’s central influence and grabbing space on the queenside.

Characteristic: The hallmark of this line is White’s hypermodern approach—controlling the center with pieces rather than pawns, and preparing to undermine Black’s advanced d4 pawn later. The fianchettoed bishop on g2 plays a key role in applying pressure along the long diagonal.

Attacking or Defensive: As White, this setup is more positional and flexible than overtly attacking; it aims to control key squares and prepare for central or flank counterplay. Black's moves are more direct and assertive in contesting space, so Black’s play can be considered more confrontational in the center and on the queenside.

Center Control: White does not immediately occupy the center with pawns but exerts influence over it with pieces, especially the bishop on g2 and knight on f3. Black occupies the center with pawns on d5 and d4, while White looks to challenge and undermine this center later. Thus, the opening involves indirect control and contesting of the center rather than direct occupation by White.