ECO code: A07
Opening Name: Reti: King's Indian Attack (KIA) 4.O-O Bg4
Moves: 1. Nf3 d5 2. g3 Nf6 3. Bg2 c6 4. O-O Bg4
This line arises from the Reti Opening with a King's Indian Attack setup for White. White develops the knight to f3 and fianchettoes the bishop on g2, aiming for a flexible and hypermodern approach. Black responds with a solid pawn structure, controlling the center with pawns on d5 and c6, and develops the bishop to g4, pinning White's knight on f3.
Characteristic of 4...Bg4: This move is thematic in many Queen's Pawn and Reti structures. By pinning the knight, Black applies indirect pressure on White's center and prepares to challenge White’s control of key squares. It also develops a piece actively without committing the central pawns too early.
Attacking or Defensive: For Black, 4...Bg4 is a semi-aggressive move, aiming to provoke weaknesses or exchanges that can ease Black’s central control. For White, the setup is flexible and can be adapted to either attacking or positional play, but at this stage White is primarily focused on solid development and control rather than immediate attack.
Center Control: This opening adopts a hypermodern approach by White, meaning White does not immediately occupy the center with pawns but aims to control it with pieces (knight on f3, bishop on g2). Black occupies the center with pawns on d5 and c6, so Black has more direct central presence early on. White’s plan is to challenge or undermine Black’s center later.
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.
Practice puzzles and train your tactics with real positions from games that used the Reti: KIA 4.O-O Bg4, and sharpen your opening mastery.
Puzzle 1 of 2 - Move #38 white