Chessy
How to Play the King's Indian Attack: Spassky Variation as Black
If you're looking to sidestep reams of main-line theory, the King's Indian Attack: Spassky Variation (1.Nf3 Nf6 2.g3 b5) offers exactly that — an early queenside expansion that sets White immediate problems. With 2,324 games in the database, Black actually scores a slim 48.5% win rate here, edging out White's 46.9%. The engine gives +0.28, a tiny plus for your opponent, meaning you are slightly worse but far from lost. Below you'll face the critical position: White to move, and how you respond determines whether your space advantage becomes real pressure or a weakness.
Play the King's Indian Attack: Spassky Variation against the engine
Free, no signup — you play black, the engine adapts to your level.
Ready to test your Spassky Variation skills? Jump into the drill position below and play …b5 against the engine, aiming to reach the typical structure with …b4,
Create a free account →The Big Idea Behind …b5
Advancing the b-pawn on move two isn't a random provocation. Black immediately stakes out space on the queenside, prepares to develop the bishop to b7 (or sometimes a6), and avoids the symmetrical positions that 1…Nf6 2.g3 d5 or 1…Nf6 2.g3 g6 would create. In the Spassky Variation, Black treats White's quiet fianchetto setup as an invitation to grab room on the flank. The downside? The b5-pawn can become a target if White strikes back quickly with c4 or a4 — but notice that White's most popular continuation (Bg2, played in 2,080 out of 2,324 games) does neither of those immediately.
The Engine's Answer and the Main Line
Stockfish's best move here is Bg2 — a natural developing move that keeps all of White's options open. When White plays Bg2, the engine's recommended follow-up is Bg2 Bb7 b3 b4. That last move, …b4, is crucial: Black pushes again, grabbing even more space and preventing White from playing c4 to challenge the queenside. The resulting structure often gives Black a comfortable clamp on the light squares. As Black, you're not just making random pawn moves — each pawn advance (b5, then b4) restricts White's pieces and carves out a safe home for your own dark-squared bishop.
What the Statistics Reveal
The database numbers tell a clear story about which White moves you should hope to face. White's two most popular choices are Bg2 (2,080 games, White scores 47.1%) and d4 (60 games, White scores 50.0%). The d4 move is statistically White's best option — a 50% score suggests equality or a slight edge. On the other hand, when White plays d3 (52 games, White scores 42.3%) or e3 (34 games, White scores 41.2%), your results as Black improve noticeably. These are the rare lines; if White plays Bg2 you're in the main line; if White plays something like d3 or e3 you've likely already achieved a favourable imbalance.
Your Key Plans After Bg2
Once White plays Bg2 (the most common by far), your immediate task is to develop your pieces around the queenside space. Play …Bb7, and be ready to meet White's b3 with your own …b4, locking the queenside structure in your favour. Keep these themes in mind: 1) Your counterplay will often come on the queenside or centre depending on where White moves his pieces. 2) Be flexible — if White ignores your queenside play and castles kingside, you can consider …a5 to further expand or …e6 to build a solid centre. 3) Do not rush to weaken your kingside unnecessarily; White's bishop on g2 eyes the long diagonal and will happily punish a careless …d5 if you haven't prepared it properly. A patient approach scores well: Black's 48.5% win rate at this position shows the variation rewards understanding over memorisation.
Results across 2,324 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Bg2 | 2,080 | 47.1% |
| d4 | 60 | 50.0% |
| d3 | 52 | 42.3% |
| e3 | 34 | 41.2% |
| b3 | 24 | 54.2% |
| Bh3 | 13 | 46.2% |
Frequently asked questions
Is 2…b5 a risky move for Black?
It is not risky in the sense of being unsound — Black scores 48.5% in the database, slightly better than White. However, the move does concede a small opening edge to White (+0.28 according to Stockfish). If White knows how to respond, Black's queenside space can become a target. The risk is manageable for club players.
What is White's most dangerous response to …b5?
Statistically White's best move is d4 (60 games, White scores 50.0%), immediately challenging the centre. However, White's overwhelming favourite is Bg2 (2,080 games). Against Bg2, the engine suggests Black continues with …Bb7 and …b4 to secure the queenside space. That line is well-tested and Black scores a healthy 48+% in practice.
Can White punish …b5 immediately with a4?
White can play a4, but it is rare — it does not appear among the most-played continuations in the 2,324-game sample. If White does play a4, Black can usually capture (…bxa4) or defend (…a6) without problems. The move a4 is not a refutation, just a different way for White to handle the position.