Chessy
Indian Defense: Accelerated London System with Nc6 — Playing as White
You've opened 1.d4, and after 2.Bf4 your opponent answers with ...Nc6 — the Indian Defense: Accelerated London System. This is a lively, fighting response that immediately challenges your centre. With 3.Nf3 you've reached the tabiya, and it's Black's turn. Stockfish gives White a +0.41 edge — a small but clear advantage for you. The statistics from over 360,000 games back that up: White wins 55.6% of the time. Below you'll find everything you need to turn that edge into a full point.
Play the Indian Defense: Accelerated London System: Nc6 against the engine
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In the Accelerated London, White's bishop on f4 is already doing work — it controls the e5 square and keeps an eye on the queenside. Black's ...Nc6 move fights directly against your d4 pawn and prepares ...e5 or ...d5 strikes. Your job as White is to maintain the slight pressure you already have. You're not looking for a knockout blow here; you're aiming to finish development smoothly (Nf3 is already done) and keep the bishop active on f4. If Black misplaces a piece or overextends, your small edge can grow into something much bigger.
The Engine's Choice and How to Follow It
Stockfish's top pick in this position is e6. The full line runs: e6 a3 d5 e3. Why a3? White preempts ...Bb4 pins against your knight, keeping your structure flexible. Then ...d5 is Black's solid central response, and e3 supports the d4 pawn while leaving your dark-squared bishop free to stay on f4. The resulting structure is a calm but promising London setup where Black has committed to ...d5 early. You'll castle kingside, develop your queen to e2 or c2, and play against Black's slightly passive setup.
What the Statistics Tell You
Black has six main replies here, and the numbers show you're doing well against all of them. The most popular move is d5 (140,222 games), where White scores 55.8%. The second-most common is d6 (103,767 games, White 53.8%). e6 (57,237 games) is the engine's choice and scores 55.7% for White. g6 (14,009 games, White 52.9%) and Nd5 (12,557 games, White 55.0%) are both rare but still favour you. The standout statistic: e5 is played 8,553 times, and White scores a massive 68.3% — because this move is a known mistake.
The One Move to Punish
If Black plays e5, you've struck gold. This is an inaccuracy that loses roughly 0.9 pawns compared to the better move e6. After 1.d4 Nf6 2.Bf4 Nc6 3.Nf3 e5, you have a simple and strong reply: take with your knight, 4.Nxe5, and Black has nothing better than ...Nxe5, after which 5.dxe5 leaves you with a healthy centre, a lead in development, and Black's knight on f6 misplaced. The 68.3% White win rate here is no coincidence — this is the moment to seize a near-decisive advantage. Stay alert for it. If Black avoids e5, follow the solid e6 setup and trust your small but real edge.
Results across 362,622 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| d5 | 140,222 | 55.8% |
| d6 | 103,767 | 53.8% |
| e6 | 57,237 | 55.7% |
| g6 | 14,009 | 52.9% |
| Nd5 | 12,557 | 55.0% |
| e5 | 8,553 | 68.3% |
Frequently asked questions
Is the Accelerated London System Nc6 good for White?
Yes. Stockfish gives White a +0.41 advantage, and across over 360,000 games White wins 55.6% of the time. It's a sound opening with a slight but consistent edge for White at all levels.
What is Black's best move after 1.d4 Nf6 2.Bf4 Nc6 3.Nf3?
The engine recommends e6, preparing ...d5 and avoiding the trap of moves like e5. After e6, the main line continues a3 d5 e3, leading to a balanced but slightly favourable middlegame for White.
What if Black plays e5 against the London System?
Black's ...e5 in this position is a mistake, losing about 0.9 pawns. You can simply capture with 4.Nxe5. After Nxe5 dxe5, White has a strong centre and excellent winning chances — White scores 68.3% from there.
How should I respond to Black's most common move, d5?
After 3.Nf3 d5, you continue your normal London development. You have good results — White scores 55.8% from this position. Just develop naturally, castle, and maintain your bishop on f4.