French Defense: Queen's Knight – 3.e5 Nf6

With 3.e5 you seize a space advantage in the center. Black's knight on f6 is kicked, and Black must decide where to put it. The engine's top choice, Nd5, keeps the knight active and challenges your center from a strong square. If Black plays a passive move instead — and the statistics show most club players do exactly that — your space advantage becomes even more useful. Your light-squared bishop, the dark-squared bishop on c1, and the pawn on e5 all benefit from the extra room. The main idea for you as White is simple: develop quickly, keep your center intact, and punish any move that lets Black's knight sit poorly.

Stockfish's top recommendation here is 4.Nd5, and it's by far the most popular human choice too — played over 94,000 times in the database. After Nd5 Nxd5 exd5 d4, Black tries to chip away at your pawn center with ...d4. From here you have a few reasonable developing schemes: you can fianchetto your king's bishop, play c3 to challenge Black's d4 pawn, or develop your king-side pieces naturally. The resulting pawn structure — White's pawns on d5 and e5 versus Black's on d4 and e6 — gives you a space edge on both wings. Your light-squared bishop, stuck behind pawns, often finds a good home on f5 or g4 in this structure. The drill will let you practice the responses to Black's most common follow-ups.

The numbers tell a clear story about which Black moves cause you trouble — and which ones are gifts. Here is how White scores against each reply from the 131,363-game database: Nd5 52.5% — a slight edge, exactly what the +0.41 evaluation suggests; Ng8 52.5% — same winning percentage but the engine says this is an inaccuracy costing ~0.7 pawns; Bb4 66.0% — a blunder losing ~3.2 pawns, punish it; d5 69.8% — Black tries to fight in the center but scores poorly; Nh5 83.1% — a staggering score for White against a move that puts the knight on the rim; Ng4 75.6% — a blunder that loses ~4.2 pawns. The big takeaway: most of Black's options besides Nd5 score badly for them. Your job is to know how to meet each one efficiently.

Two Black moves stand out as particularly bad: Ng4 and Bb4, both classified as blunders by the engine. If Black plays 4...Ng4, the knight is exposed and you should strike it immediately with h3, forcing it to retreat to h6 or back to f6, gaining time. If Black tries 4...Bb4, pinning your knight, you can simply play c3, threatening the bishop and forcing Black to decide whether to give up the pair or retreat. The numbers confirm these moves are losing for Black — your practical results against them are above 66% and 75%. The engine's evaluation says they cost Black several pawns, so you should be confident pushing for a full point whenever you see them.