How to Play the Indian Defense: Accelerated London System d5 as White

The Accelerated London System (d5 version) is all about building a strong pawn centre without overextending. After 1.d4 Nf6 2.Bf4 d5 3.e3, you have anchored your pawns on d4 and e3, with the bishop on f4 eyeing the queenside. Your plan is simple: develop naturally with Nf3, c3, and then castle. You are not committing to an early c4 push, which keeps the position flexible. Black has many options here, but none should trouble you if you follow solid development. The statistics confirm this is a fighting but fair position: White wins 51.4% of games, and draws are rare at just 4.3%, meaning most games produce a decisive result in this balanced setup.

In this position, Black plays e6 most often (over 3.2 million games), giving you a 51.7% score. After e6, continue with Nf3, and if Black plays c5, you can support d4 with c3 or develop your knight. The next most common is Nc6 (2.5 million games), where White scores even better at 53.5%. Against Nc6, you can again play Nf3, and if Black grabs the bishop with e6 or Bf5, you have solid responses. Bf5 appears in 2.2 million games with a 50.2% score — basically dead even. Here Nf3 is still right, and you can consider c4 later to challenge Black's light-squared bishop. The surprise option c5 (the engine's top move) scores only 47.3% for White, so be aware: if Black plays c5, you are already in a sharp line where accurate play matters. Other moves like g6 (49.3%) and a6 (51.7%) are less common but still manageable — just develop normally.

Your main strength in this position is that Black must decide how to handle your bishop on f4. If Black plays e6, the bishop stays active and you can aim for a later e4 break after preparation. If Black plays Bf5, you might consider g4 to chase it, but only after completing development. Against Nc6, watch out for knights jumping to b4 or d4 — keeping c3 available addresses most threats. The engine suggests 3...c5 as Black's best response. If you face it, develop with Nf3 and aim to control the centre. Play revolves around piece activity. In all variations, remember: develop quickly, castle early, and only push in the centre when your pieces are ready. With 51.4% wins, patience is your best weapon.

The biggest mistake White players make in this line is over-pressing. Your position is already sound — you do not need to force an advantage. Do not play c4 too early unless Black commits to a setup that allows it safely. Another pitfall: forgetting to castle. After ...Bf5, some White players get distracted attacking the bishop and leave their king in the centre, which can backfire if Black opens the centre with ...c5 and ...e6. Also, be careful against ...c5: if you capture on c5, Black recaptures and the resulting structure requires precise piece play. The stats show White scores just 47.3% after 3...c5, so if you are not comfortable with IQP positions, consider meeting ...c5 with c3 or Nf3 first. Overall, stick to simple development, castle by move 7-8, and you will score well in this balanced line.