Rapport-Jobava System: Playing 4.Nb5 against Nf6

Your knight on b5 eyes c7, a typical weak point in Black's camp since the bishop on f8 hasn't developed yet. Black's most logical response is to defend c7 with a developing move — and that's exactly what you hope for. The engine's top choice for Black is Na6, bringing a knight to the rim to cover c7. After that, a typical continuation runs Na6 e3 Be7 h4, where White has already gained space on the kingside while Black's knight looks a little awkward on a6. Your plan is straightforward: develop with e3, get your king to safety, and look to launch an attack on the kingside with moves like h4, g4, and eventually Bh3 or Qh5. The bishop on f4 is well placed, eyeing c7 even after the knight eventually moves.

From a practical standpoint, this position is incredibly close to balanced. Across 822,231 games from this exact point, White wins 49.5%, draws 4.0%, and Black wins 46.4% — as tight a statistical split as you'll see. That 4% draw rate is worth noting: this opening tends to be sharp, with one side winning the vast majority of games. If you enjoy uncompromising chess where you can outplay your opponent in the middlegame, this system is a strong choice. The most-played reply is Bd6 (399,780 games), where Black immediately challenges your bishop. Against that, White scores 46.0% — not great, but not terrible either, and there's plenty of room to improve with good preparation. The second most popular move is Na6 (323,235 games), where White scores a healthier 47.8%.

One of the best reasons to play the Rapport-Jobava is that Black can easily go wrong if they don't know the theory. Three moves that look natural are actually serious errors, and recognising them will win you many quick games. - c6 (23,543 games) is a blunder — the engine says it loses about 3.5 pawns. It's understandable: Black wants to kick your knight, but after 4...c6 your knight can jump to a3 or d6, and you end up with a dominant position. White wins a massive 77.2% of the time here. - a6 (11,685 games) is even worse — a blunder that loses roughly 4.2 pawns. Black chases your knight but the pawn on a6 becomes a serious weakness, and your knight retreats to a3 or c3 with terrific play. White scores 79.7% against this move. - c5 (8,551 games) is a mistake costing about 2.6 pawns. Black tries to strike in the centre but has no development to back it up. White scores 72.8% here. Remember: in each case, Black's best was Na6. If your opponent plays any of these, you should be winning.

Black's most common move is Bd6, immediately challenging your bishop on f4. This is not a mistake — it's a principled developing move that contests your best-placed piece. After 4...Bd6, you'll need to decide how to handle the tension. The statistics show White scores 46.0% here, so it's the toughest test for your preparation. Your typical ideas: you can exchange on d6 to damage Black's pawn structure, or support the bishop and retreat to g3 or d2. If you do capture on d6 (Bxd6), Black recaptures with the c-pawn, giving them a doubled pawn but also a half-open c-file. The doubled pawns on d6 and d5 can become a long-term target, but Black gets active play. This is a rich strategic battle — not a forced line — and the Rapport-Jobava system rewards players who understand the resulting pawn structures.