Named after its best-known practitioner, the Jobava London System gives White a 1. d4 opening built on two early developing moves, the queen’s knight to c3 and the dark-squared bishop to f4. Its reference position is 1. d4 d5 2. Nc3 Nf6 3. Bf4, and Black’s third move decides what kind of game follows. Against 3...Nc6 or 3...e6 the knight heads for b5 to hit c7, a square the f4-bishop already watches; against 3...Bf5 or 3...c6 White’s g- and h-pawns go after the bishop; against 3...c5 the answer is e4. A careless reply can drop a pawn or more before move ten, and a careful one still has to deal with a kingside pawn storm later.
At club level the traps matter as much as the theory. In lichess games between players rated roughly 1000 to 1600, about one in four opponents answers 3. Bf4 with 3...Nc6, and White scores around 62% after it, higher than after any other common reply. This page and its trainer cover the 2. Nc3 plus Bf4 system only. If you want the classical setup with 2. Bf4 and the c3-d4-e3 pawn triangle, that is Chessigma’s separate London System course; the two share the bishop and very little else.
Play 1. d4 and, after 1...d5, bring out the knight first with 2. Nc3, then the bishop with 3. Bf4 once Black has played 2...Nf6. Many opponents never allow that exact position: in club games more than half of Black players answer 2. Nc3 with something other than 2...Nf6, most often 2...e6 (about one in five), 2...Nc6 (about one in seven), 2...c6 or an early 2...Bf5. Against most of them White still plays 3. Bf4 next and keeps the Nb5 and e4 ideas in reserve; only the early central strikes 2...c5 and 2...e5 get a different answer (3. e4 and 3. dxe5), and in the trainer’s lines both win material. There is also a door from 1...Nf6: after 1. d4 Nf6 2. Nc3 d5 3. Bf4 you are back in the same position. Be aware that 1...Nf6 2. Nc3 g6 and 2...e6 lead to different openings that this system does not reach.
Strengths
Drawbacks
The c7 fork against 3...Nc6
1. d4 d5 2. Nc3 Nf6 3. Bf4 Nc6 4. Nb5 e5 5. Bxe5 Nxe5 6. dxe5 Nd7 7. Qxd5 c6 8. Nd6+ Bxd6 9. Qxd6
This is the most common reply to 3. Bf4 at club level, and after 4. Nb5 roughly three in four Black players try the freeing 4...e5. White takes twice on e5, then collects d5 with the queen. The trainer teaches both knight retreats: after 6...Nd7 the knight check on d6 leaves White two pawns up with the queen on d6 stopping Black from castling, and after 6...Ne4 the queen trade on d5 sets up Nxc7+, a fork of king and queen that leaves White three pawns up.
Nb5 and the bishop pair against 3...e6
1. d4 d5 2. Nc3 Nf6 3. Bf4 e6 4. Nb5 Bd6 5. Nxd6+ cxd6 6. e3 Nc6 7. Nf3 O-O 8. c3
About one Black player in five chooses the solid 3...e6. The knight still jumps to b5, and when Black defends c7 with ...Bd6, White simply takes the bishop. You keep the two bishops, Black has doubled d-pawns, and the plan is calm: e3, Nf3, c3 and h3, with the f4-bishop tucked back to h2 if it is attacked. If Black guards c7 with ...Na6 instead, the course shows two answers: Bxa6 to leave Black with doubled, isolated a-pawns, or Ne5 followed by g4 for a kingside attack.
Trading bishops against 3...Bf5
1. d4 d5 2. Nc3 Nf6 3. Bf4 Bf5 4. e3 e6 5. Nf3 Bb4 6. Bd3 Bxd3 7. cxd3 O-O 8. O-O
Roughly one opponent in five or six mirrors the bishop with 3...Bf5. White switches to a steady e3 and Nf3 setup and offers the light-squared bishops with Bd3. Recapturing with the c-pawn gives White a strong grip on e4 and c4 and a half-open c-file for queenside play. If Black prefers ...Bd6, the course turns aggressive with Ne5 and an early g4.
g4 and h4 against the ...c6 and ...Bf5 setup
1. d4 d5 2. Nc3 Nf6 3. Bf4 c6 4. e3 Bf5 5. Nf3 e6 6. Ne5 Nbd7 7. g4 Bg6 8. h4
When Black builds a Slav-style position with ...c6 and ...Bf5, the bishop on f5 becomes a target. The knight on e5 covers g6, the g-pawn kicks the bishop and h4 prepares h5 to hunt it again. The trainer follows the main Black defenses from here, including one where the bishop ends up stuck on e4 after 11. f3, and it reaches the same attack from 2...c6 as well.
The g-pawn push against 3...a6
1. d4 d5 2. Nc3 Nf6 3. Bf4 a6 4. e3 e6 5. g4
About one in six opponents plays 3...a6 to keep the knight out of b5. White does not need that square: after 4. e3 and 5. g4 the pawn is headed for g5 to chase the f6-knight. The course covers the pawn sacrifice after 5...Bb4 6. Ne2 Nxg4 7. Rg1, where White trades the g-pawn for an open g-file, and a long-castling plan against 5...c5.
The h-file attack against 3...g6
1. d4 d5 2. Nc3 Nf6 3. Bf4 g6 4. e3 Bg7 5. h4 O-O 6. h5 Nxh5 7. Rxh5 gxh5 8. Qxh5
Against a kingside fianchetto White pushes the h-pawn at once. If Black castles into it and grabs the pawn with ...Nxh5, White gives the rook on h5 to rip open the file, and the queen arrives on h5 with a lasting attack. In club games White scores close to 70% from the final position, which is why it is the last line of the course.
If you meet the Jobava London as Black, the club numbers point to the safe replies. White scores about 62% after 3...Nc6 but only 51 to 52% after 3...e6 or 3...a6, so the knight on c6 is the move to skip, above all with 4...e5 after 4. Nb5. The trainer shows where Black’s games go wrong: after 4...e5 5. Bxe5 Nxe5 6. dxe5, both knight retreats, 6...Nd7 and 6...Ne4, cost two or three pawns; against a setup with ...c6 and ...Bd6, a knight on e5 can jump into f7; and a bishop on f5 chased by g4 and h4 can end up trapped on e4. If you choose 3...e6, decide in advance how you will meet 4. Nb5: ...Bd6 gives White the bishop pair, and ...Na6 puts a knight on the rim. You can also avoid the system with 1...Nf6 and, after 2. Nc3, 2...g6 or 2...e6.
For White
Develop the knight to c3 and the bishop to f4 first, then read Black’s third move. Against ...Nc6 and ...e6, jump to b5 and aim at c7, taking the bishop pair with Nxd6+ when Black guards with ...Bd6. Against ...Bf5, play e3 and Nf3 and swap light-squared bishops with Bd3. Against ...c6 with ...Bf5, add Ne5 and chase the bishop with g4 and h4. Against a fianchetto, push the h-pawn to h5. Against 2...c5 or 3...c5, strike with e4 and play for open lines. Castle long when your pawns are already storming the kingside.
For Black
The data says 3...e6 and 3...a6 hold White to about an even score, while 3...Nc6 does not. After 3...e6 4. Nb5, choose between giving up the bishop pair with ...Bd6, which leaves you solid doubled d-pawns, and a knight trip ...Na6 to c7 that costs time. Put your light-squared bishop on f5 only with a plan against g4 and h4, and do not push ...e5 while White’s bishop and d-pawn can both take there.
Some databases file it as the Rapport-Jobava System, after two grandmasters: the Georgian Baadur Jobava, who made 2. Nc3 with Bf4 a regular weapon and gave a rare move order an identity of its own, and the Hungarian Richard Rapport, who took it up as well. At club level it is still a minority choice: in lichess games between players rated about 1000 to 1600, 2. Nc3 comes in roughly one game in eleven after 1. d4 d5. You will meet it most in fast online games, and it suits players who like the London’s bishop but want sharper positions. On Chessigma it is the companion to the London System course, which covers the 2. Bf4 move order.