ECO code: A12
Opening Name: English: Caro-Kann Defence 3.b3 Nf6 4.g3 Bg4
Moves: 1. c4 c6 2. Nf3 d5 3. b3 Nf6 4. g3 Bg4
This line arises from the English Opening, where White opts for a flexible and somewhat positional setup with 3.b3 and 4.g3, aiming to fianchetto both bishops. Black responds with a Caro-Kann style structure, challenging the center with ...c6 and ...d5, and develops actively with ...Nf6 and ...Bg4.
Characteristic of the Move 4...Bg4: The move Bg4 pins White’s knight on f3, putting subtle pressure on White’s control of the center and kingside. It is a thematic developing move in many Caro-Kann and English Defense setups, aiming to provoke weaknesses or gain the bishop pair.
Attacking or Defensive: For Black, this line is somewhat attacking in nature, as Black actively challenges White’s knight and eyes control over central squares. For White, the setup is generally positional and flexible, focusing on solid development and long-term control rather than immediate attacks.
Center Control: Black directly challenges the center with ...c6 and ...d5, establishing a foothold in the center early on. White, meanwhile, uses a more indirect approach by fianchettoing bishops and controlling key central and flank squares rather than occupying the center immediately with pawns.
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.