After the modest 1.a3 Nf6, you can immediately steer into familiar territory with 2.d4. You've essentially transposed into a d4 opening where Black has an extra move — but not much of one, since that move was ...Nf6, which they'd likely play anyway. The engine gives this position +0.06, which is dead level — meaning you are neither better nor worse out of the opening. Below you'll find the statistics that reveal how this position actually plays out in practice, and the interactive drill lets you test your feel for the resulting middlegame.
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Play the Anderssen's Opening: Nf6 against the engine
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Ready to try it? Use the interactive board below to explore the Anderssen's Opening: Nf6 against different Black replies. Practice the engine's recommended line
Find your own #1 mistake — free →What You're Really Playing For
Don't let 1.a3 fool you — you've built a perfectly respectable d4 opening. The position after 1.a3 Nf6 2.d4 is essentially a Queen's Pawn game where Black's knight is already developed to f6. That a3 move, while not doing much for development, prevents ...Bb4 ideas and gives your bishop a safe square on a2 if needed. The key takeaway: you're not playing a weird sideline. You're playing a normal d4 opening with a tiny extra safety net. Focus on standard development — get your knights out, castle, and fight for the centre. Black has many options here, and the statistics show that none of them gives either side a big edge.
Where the Numbers Land
Looking at 125,780 games from this exact position, the practical results are remarkably balanced: White wins 46.6%, Black wins 49.2%, and draws are rare at 4.2%. That slight underperformance for White in the win column reflects the fact that a3 doesn't do much to help your position, but it doesn't hurt you either. The engine's best continuation is 2...d5, after which you should aim for Nf3, Bf5 (developing with a threat to your queen — just move it sensibly), and Bg5. This is a solid, unambitious setup that keeps the position level. Against most Black replies, your job is simple: develop naturally, keep an eye on the centre, and don't overreach because of the a3 move.
Black's Most Popular Replies
Black's most common move is 2...g6, played in 39,187 games, where White scores 45.5%. This prepares a KID-style setup. The second most popular is 2...d5 (34,869 games, White scores 47.2%), which leads the position the engine considers best. Next is 2...e6 (28,548 games, White scores 46.9%), a solid Queen's Gambit declined structure. Then 2...d6 (6,575 games, 46.1%) and 2...c5 (4,649 games, 44.9%). Notably, 2...Nc6 is flagged as an inaccuracy — it loses roughly 0.5 pawns of advantage, and the better move was 2...g6. Yet interestingly, in those 3,674 games where Black played 2...Nc6, White scores 50.7%, your best winning percentage against any common reply. So if Black errs, be ready to capitalise.
Style and Practical Advice
. The tone here is casual and instructional — aimed at club-level players who want to understand this opening without getting buried in theory. The data comes from Lichess games, so it reflects amateur play rather than grandmaster preparation. Your approach as White should be patient. You don't have a knockout punch from the opening, but you also have zero weaknesses. Focus on completing development, castling, and reaching the middlegame with a flexible pawn structure. If Black plays 2...Nc6, you've already gained a small edge — just keep building pressure. Remember: 1.a3 isn't a joke move, it's a quiet invitation to play your favourite d4 lines with a slight safety buffer.
Results across 125,780 Lichess games
| Most-played continuation | Games | White wins | |
|---|---|---|---|
| 1 | g6Main line | 39,187 | 45.5% |
| 2 | d5 | 34,869 | 47.2% |
| 3 | e6 | 28,548 | 46.9% |
| 4 | d6 | 6,575 | 46.1% |
| 5 | c5 | 4,649 | 44.9% |
| 6 | Nc6 | 3,674 | 50.7% |
Frequently asked questions
Is 1.a3 a good opening move for beginners?
Yes, it's very playable for beginners. It avoids heavy opening theory while transposing into familiar d4 structures. The resulting position is solid and level, so you can focus on learning middlegame principles rather than memorising lines. Just be aware that a3 doesn't help with development — make sure you catch up on moves like Nf3, e3, and Bf4 quickly.
What should I do if Black plays 2...c5?
2...c5 is a direct attempt to challenge your centre. You can respond with 3.d5, which is the engine's preferred continuation, or play 3.e3 or 3.Nf3. The resulting position is similar to a Benoni structure. White's winning percentage here is 44.9%, slightly below average, so be careful not to lose your d5 pawn and aim for solid development.
Why is 2...Nc6 considered a mistake?
The engine evaluates 2...Nc6 as an inaccuracy that costs Black about half a pawn. The knight on c6 doesn't pressure d4 effectively and may later become a target after you play d5. The better move was 2...g6, preparing a KID setup. If Black plays 2...Nc6, you can respond with 3.d5, forcing the knight to retreat to b8 or move to a5, gaining time and space.
How many games feature the Anderssen's Opening: Nf6?
Over 125K Lichess games have reached the Anderssen's Opening: Nf6 position. White wins 46.6%, Black wins 49.2%, with 4.2% draws — based on real rated games.