Reti: KIA, 2...c5, 3.Bg2 Nc6 4.O-O e6 5.d3 Nf6 6.Nbd2 b6

Opening Name: Reti: King's Indian Attack (KIA), 2...c5, 3.Bg2 Nc6 4.O-O e6 5.d3 Nf6 6.Nbd2 b6

Moves: 1. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. O-O e6 5. d3 Nf6 6. Nbd2 b6

Description: This variation of the Reti Opening blends hypermodern ideas with a King's Indian Attack setup for White. White fianchettoes the kingside bishop early with Bg2, castles quickly, and adopts a flexible pawn structure with d3 and Nbd2, aiming for a solid but dynamic position. Black challenges the center with c5 and develops actively with Nc6 and Nf6, preparing to contest the center and queenside. The move ...b6 by Black supports the development of the bishop to b7, reinforcing control over the central dark squares.

Characteristic of the Move 6...b6: This move is a typical thematic idea in these structures, preparing to fianchetto Black's light-squared bishop to b7. It aims to increase pressure on the central and queenside light squares, complementing Black's contest for the center and adding flexibility in the pawn structure.

Attacking or Defensive: From White's perspective, the setup is more positional and flexible, focusing on controlling key squares and maintaining a solid structure rather than immediate aggressive attacks. For Black, the moves are semi-active, aiming to challenge White's control of the center and prepare counterplay on the queenside and center. Overall, White's play is more strategic and restrained, while Black seeks counter-attacking chances.

Center Control: This opening does not involve an immediate or direct occupation of the center by White's pawns; instead, White exerts pressure on the center from a distance using pieces and a pawn structure that supports eventual central breaks. Black, meanwhile, challenges the center more directly with pawns on d5 and c5, aiming for active piece play and central counterplay.