King's Indian Attack · A05

Wahls Defense

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. O-O O-O 5. d3 d5

White's kingside bishop takes the long diagonal and Black'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... g6 Prepares the fianchetto: the bishop will take the long diagonal via g7. Theory calls this the Symmetrical Defense.

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