Chessy
King's Indian Attack: Smyslov Variation — A Surprising Flank Opener
The King's Indian Attack is famous for its solid, positional approach, but the Smyslov Variation takes a sharp detour. After 1.Nf3 Nf6 2.g3 g6, White lashes out with 3.b4 — a flank pawn thrust that aims to seize space on the queenside before Black can even commit their pieces. In over 1,400 games from this exact position, White scores an impressive 53.0%, with Black winning only 43.1% of the time. The engine considers the position dead even at -0.12, meaning your results will come from understanding the plans better than your opponent. Below the drill, you'll get to test this lively line against an engine that adapts to your play.
Play the King's Indian Attack: Smyslov Variation against the engine
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Ready to test the Smyslov Variation? Play the interactive drill below — the engine adapts to your moves, so you can practise punishing b5 and navigating the Bg7
Create a free account →The Core Idea: Flank Space Before Centre
The Smyslov Variation isn't about grabbing a pawn or launching a direct attack — it's about expansion. By playing 3.b4, White says: 'I'll take space on the queenside before you can stop me.' If Black lets you, Bb2 follows, putting pressure on the long diagonal. Meanwhile, your king finds safety after a quick fianchetto (Bg2) and a patient build-up with d3 and Nbd2. The engine's best line is Bg7 Bb2 d5 d3 — Black develops normally while you keep your structure flexible. You are slightly worse numerically (-0.12), but in practice the position offers rich play with very little theory.
The Engine's Best Answer — And Your Plan
Stockfish's top reply for Black is Bg7 (played in 1,303 of 1,483 games). After Bg7, your response is Bb2, completing the fianchetto on the long diagonal. Black typically follows with d5, and you answer with d3, building a solid centre while keeping your options open. The engine continuation from there is simple: develop pieces, castle quickly, and decide later whether to strike in the centre with e4 or expand further on the queenside with a4 or c4. There's no forced win here — just good, flexible chess where you steer the game toward positions you know better than your opponent.
What the Statistics Reveal
Across 1,483 games at this exact position (Lichess database), the numbers tell a clear story. White's winning percentage of 53.0% is a full ten points higher than Black's 43.1%, with only 3.9% draws. That's a high conversion rate for a position the engine calls dead even. The second most popular move, b5, has been played 46 times but is flagged as a known mistake — it loses roughly 0.9 pawns. White scores an enormous 67.4% when Black plays b5, so if you face this, you're already winning. Other rare replies like d6 (24 games, White scores 41.7%) and e6 (22 games, White scores 40.9%) show Black struggling more, suggesting the Smyslov Variation is trickier for unprepared opponents than the engine evaluation lets on.
The One Mistake to Punish
The data reveals a single concrete inaccuracy: b5. When Black tries to copy your flank expansion with 3...b5, it's a clear error that drops roughly 0.9 pawns. The engine says Bg7 was better by that margin. Why is b5 bad? It weakens Black's queenside and does nothing to contest the centre. You can punish it by continuing development — Bb2 followed by Bg2 and d3, then looking to open lines on the queenside with a4 or c4. Your opponent's misplaced pawn becomes a target. If you face b5 in the drill, trust that you have a meaningful advantage and play actively.
Results across 1,483 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Bg7 | 1,303 | 53.0% |
| b5 | 46 | 67.4% |
| d5 | 36 | 47.2% |
| d6 | 24 | 41.7% |
| e6 | 22 | 40.9% |
| b6 | 17 | 58.8% |
Frequently asked questions
Is the King's Indian Attack: Smyslov Variation good for beginners?
Yes — it involves very little forced theory and relies on understanding general principles like fianchettoing your bishops, controlling the centre with pawns, and expanding on the flank. The key idea (3.b4) is easy to remember, and the engine evaluation of -0.12 means you're not taking a strategic risk.
What is the main idea behind 3.b4 in the Smyslov Variation?
White stakes out space on the queenside before Black has committed their pieces. The b4 pawn supports a future Bb2 on the long diagonal, and it discourages Black from playing ...c5 or ...b5 themselves. It's a hypermodern grab for space that often surprises opponents used to slower King's Indian Attack setups.
How should Black reply to the Smyslov Variation?
The engine's top reply is Bg7 (1,303 games), continuing with Bb2 d5 d3. This leads to a normal-looking position where Black develops solidly. The second most popular move, b5, is actually a mistake that loses roughly 0.9 pawns — Black should avoid copying your flank thrust.
Why does White score over 53% if the position is equal?
The engine evaluation of -0.12 is dead even, but practical results favour White (53.0% wins vs 43.1%). This suggests the Smyslov Variation is less intuitive for Black to handle. Many Black players respond inaccurately — especially with b5 — giving White a clear edge without needing perfect play.