with e6

This line of the Rapport-Jobava System, or Jobava London, comes from 1. d4 d5 2. Nc3 e6 3. Bf4. White uses the same setup as in the parent line, with the queen's knight on c3 and the bishop on f4. Black has played ...e6 before committing the king's knight. That choice gives up the option of developing the light-squared bishop to f5 outside the pawn chain. In return, the f8-bishop becomes free at once, and Black can arrange the pieces according to what White does next.

The main options all deal with White's familiar pressure on c7. The most popular, 3...Nf6, transposes to the parent opening's main ...e6 branch, a compact position in which ...Bd6 or ...c5 usually follows. With 3...Bd6, the second most common choice, Black guards c7 directly and challenges the f4-bishop before ...Nf6. White must then decide whether to trade bishops or retreat. 3...c5 is the most direct reply: it attacks d4 immediately and aims for an open center before White has finished developing. The engine's first choice is 3...Bb4, which pins the c3-knight against the king. This weakens the Nb5 idea and prepares to double White's pawns with ...Bxc3.

Structurally the play resembles the slower London-type positions. Black's pawns on d5 and e6 give a solid but somewhat passive chain. The c8-bishop is the piece that suffers most, and Black usually frees the game with ...c5. White, whose c-pawn is blocked by the knight, has no c4 break. White's play relies instead on central expansion with e3 or e4 and on kingside activity.

The engine rates the position as balanced. In a large body of Lichess games, results are close, with White slightly ahead and draws rare. The position ranks among the more frequently reached named openings in online play. Because Black has not yet committed the king's knight, the line is a flexible way to meet the Jobava, and transpositions between its branches are common.