Chess Openings Lab
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King's Indian Attack: Wahls Defense

The Wahls Defense is 1.Nf3 Nf6 2.g3 g6 3.Bg2 Bg7 4.O-O O-O 5.d3 d5, where both sides fianchetto and Black grabs the center with ...d5. White plans Nbd2 and e4 for a King's Indian Attack setup, while Black aims for ...e5 and central space.

Moves
1.Nf3 Nf6 2.g3 g6 3.Bg2 Bg7 4.O-O O-O 5.d3 d5
ECO
A05
Engine
−0.18 · level (Stockfish 17.1, depth 20)
Played
431 games in our lichess sample
White scores
51.2%

Key ideas for both sides

White

  • 6.Nbd2 is the engine's choice, preparing e4 or Ne5 against Black's center.
  • Ne5 can trade off Black's queenside knight after ...Nbd7 and eye d7.
  • c4 is an option to attack d5 and open the c-file for the rooks.
  • Play e4 with support from Nbd2 and c3 to challenge Black's center.

Black

  • Play ...Re8 to prepare ...e5 and grab central space before White's e4 lands.
  • Use ...a5 to gain queenside space and stop White from playing b4.
  • Answer c4 with ...Nc6 and recapture on d5 with the f6 knight.
  • Keep the g7 bishop active on the long diagonal aimed at b2.

Plans and pawn structure

Both sides have mirrored kingside setups. White plays Nbd2, e4 and sometimes c3, aiming for a King's Indian Attack with a kingside attack. Black plays ...Re8, ...e5 and ...a5, grabbing central and queenside space. The middlegame turns on central control: if White's e4 break works, White gets kingside pressure; if Black's ...e5 holds, Black has the space edge. After c4 and cxd5, the game becomes more open and piece play matters most.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position −0.18: level. Its three top choices for White:

  1. −0.18 6.Nbd2 Re8 7.Ne5 a5 8.a4 Nbd7
  2. −0.18 6.c4 Nc6 7.cxd5 Nxd5 8.Re1 a5
  3. −0.21 6.c3 Re8 7.Nbd2 e5 8.e4 c6

Pawns, from White's side.

How it scores on lichess

431 rated lichess games reached this position; White scored 51.2%.

1200–159954.2%
1600–199950.4%
2000 and up51.5%

Light: White wins. Grey: draws. Dark: Black wins. About the sample.

How to play against it

As White, play Nbd2 and e4. Do not let Black play ...e5 freely. Use Ne5 or c4 to keep Black's center under pressure, and answer ...a5 with a4 so Black cannot grab more queenside space or use b4. Then push e4 with real support.

Questions

What are the moves of the King's Indian Attack: Wahls Defense?

The King's Indian Attack: Wahls Defense starts 1.Nf3 Nf6 2.g3 g6 3.Bg2 Bg7 4.O-O O-O 5.d3 d5. Its ECO code is A05.

Is the King's Indian Attack: Wahls Defense good for Black?

Stockfish 17.1 rates the position −0.18 at depth 20, which is level. In 431 lichess games from our sample, White scored 51.2%. A solid, balanced choice for Black players who like central space; White needs patient play to make e4 work.

What is the main idea of the King's Indian Attack: Wahls Defense?

Both sides fianchetto and castle. Black grabs the center with ...d5, and White plans Nbd2 and e4 to challenge it.

What should White play next?

The engine's first choice is Nbd2, with c4 and c3 close behind. 6.Nbd2 prepares e4 and keeps options for Ne5 against Black's center.

Updated October 2026. Sources and method.