ECO code: A05
King's Indian Attack: Symmetrical Defense (3.b3 Bg7 4.Bb2 O-O)
This opening arises after the moves 1. Nf3 Nf6 2. g3 g6 3. b3 Bg7 4. Bb2 O-O. White adopts a flexible setup known as the King's Indian Attack (KIA), characterized by a fianchettoed bishop on b2 combined with a solid knight on f3 and a kingside pawn structure aimed at a later central and kingside expansion.
Characteristic of the move 3.b3: The move 3.b3 supports the development of the dark-squared bishop to b2, reinforcing control over the central squares e5 and d4 from a distance. This setup is somewhat less common than the classic 3.Bg2 but maintains the thematic fianchetto that is central to the KIA. It creates a symmetrical pawn structure mirroring Black’s setup.
Attacking or Defensive: As White, this setup is generally flexible and positional, allowing for both defensive solidity and potential attacking chances later on. White typically aims to build up pressure gradually rather than launching immediate attacks. Black’s symmetrical setup is also solid and primarily defensive, focusing on controlling key squares and preparing counterplay.
Center Control: This variation does not involve an immediate direct contest of the center with pawns but rather a strategic battle for central influence through piece placement and pressure from the long diagonal (b2-g7). White delays direct central pawn advances, relying on the fianchettoed bishop and knight to exert control over central squares indirectly.
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 King's Indian Attack: Symmetrical Defense 3.b3 Bg7 4.Bb2 O-O, and sharpen your opening mastery.
Puzzle 1 of 3 - Move #9 white