How to Play the Scandinavian Defense: Main Line with 3...Qa5 and 4.d3

After 4.d3 Nf6, the engine evaluates the position at +0.24 – a tiny plus for White, but for practical purposes the opening is completely balanced. From your perspective as Black, you are not worse at all. You have already achieved a solid development: your queen is safely on a5, your knight is on f6, and you can now finish your development smoothly. The key thing to notice is that White's last move, d3, is modest. White has not tried to chase your queen with something like Nf3 immediately, nor has White committed to a kingside fianchetto. This means you have time to get your pieces out before any serious fight begins.

Stockfish's top move here is 5.Bd2 – developing with a threat. White attacks your queen and forces it to move again. The engine's suggested continuation after Bd2 is 5...Bg4 6.Nf3 Nc6. Let's break that down. After 5.Bd2, your most natural reply is 5...Bg4, pinning the knight White will likely play to f3. When White plays 6.Nf3, you develop your other knight to c6, putting pressure on the centre and completing your queenside development. This setup is extremely solid: you have a pin on the knight, both knights are active, and your queen can retreat to b6 or c7 depending on how the game goes. You have no weaknesses and easy piece play.

Looking at the most-played continuations from this position gives you a clear roadmap. The overwhelming favourite is 5.Bd2 (542,236 games), where White scores a middling 46.4% – meaning Black scores 53.6%. That is a healthy plus for you. The second most common is 5.Nf3 (52,832 games), and here White scores even worse: 44.9%, so Black scores 55.1%. Whether White plays Bd2 or Nf3, you are getting a good result in practice. The rare move 5.h3 (7,910 games) and 5.Be2 (6,047 games) are also unthreatening. The most dangerous-looking alternative, 5.g3 (4,886 games), still only scores 46.3% for White. In short, no matter what White does, the statistics confirm you are not in trouble.

One move you should be especially happy to see is 5.Bf4. This is flagged as a clear inaccuracy, losing about half a pawn compared to the better 5.g3. White places the bishop on f4, where it looks active but proves poorly placed once you challenge it. After 5.Bf4, you can immediately play 5...c5, staking a claim in the centre, or simply continue with natural development like 5...Bg4 or 5...Nc6. The engine's recommendation of 5.g3 instead shows that White should be looking to fianchetto the kingside bishop to contest the long diagonal. When White plays Bf4 instead, you have a small but real edge – the statistics back this up, with White scoring only 40.2% from those 3,817 games. Keep an eye out for this move and be ready to seize the initiative.