King's Indian Attack, with Bf5 · A07
Main line, through 4... Bf5
1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5
White's kingside bishop takes the long diagonal.
The first 4 moves, explained
- 1. Nf3 Develops the knight to f3, eyeing d4 and e5. Theory calls this the Zukertort Opening.
- 1... Nf6 Develops the knight to f6, eyeing d5 and e4.
- 2. g3 Prepares the fianchetto: the bishop will take the long diagonal via g2.
- 2... d5 Stakes a claim in the centre, controlling e4, and frees the bishop and queen. Theory calls this the King's Indian Attack.
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Where this fits
This line is one of 5 in the King's Indian Attack, with Bf5. If you want to know where your own games leave it, the guide on leaving theory explains how that is found.