Queen's Pawn Game: London System

The London System (1.d4 d5 2.Nf3 Nf6 3.Bf4, or 2.Bf4 straight away) is a solid "system" opening for White. White plays nearly the same setup against almost anything Black does: d4, Bf4, e3, Nf3, c3, Bd3 and Nbd2, forming a pyramid of pawns and pieces. It has become popular at club level in the 21st century.

Origins

The first master to play it regularly was James Mason in the 1880s. The name comes from the very strong London tournament of 1922, where it appeared seven times, including in games by Capablanca, Alekhine and Rubinstein. It then remained rare in grandmaster play for decades. In the 21st century players such as Gata Kamsky, Levon Aronian and Magnus Carlsen began to use it more often, and it became popular with club players thanks to its solid nature and clear plans.

The idea

The dark-squared bishop comes out to f4 before e3, so it isn't shut in, unlike in the Colle System, where it goes to b2 or stays on c1. White then builds the c3–d4–e3 pyramid, places the bishop on d3 and the knight on e5, and often aims for a kingside attack. Because the setup is almost the same every game, there is less opening theory to learn than in many other openings.

Main lines

• 2.Nf3 Nf6 3.Bf4, the classic London shown on this page, with the ...e6 setup as a common alternative for Black.
• The Accelerated London 2.Bf4, a move order that has become common since 2005, and the same idea against 1...Nf6: 2.Bf4 or 2.Nf3 and 3.Bf4.
• The Jobava London with Nc3 and Bf4, a relative with considerable attacking value.

A popular plan for Black at higher levels is an early ...c5 with ...Qb6, aiming at the b2-pawn, which Johnsen and Kovačević considered the most critical line. Against a King's Indian setup (...g6, ...Bg7, ...d6), White must be ready for ...e5.

Strengths and weaknesses

Strengths

• Very little theory: one setup against almost everything.
• Solid structure with a safe king and clear plans (Ne5, kingside attack, or a slow squeeze).
• Avoids the opponent's main-line preparation against 1.d4.

Weaknesses

• Against accurate play it gives only a small advantage, and Black equalises comfortably.
• Played on autopilot, it becomes predictable. Black can prepare a specific anti-London plan.
• The b2-pawn and the queenside can become targets after ...c5 and ...Qb6.

Who should play it

The London is ideal for players with little time for theory who want a reliable, low-risk position every game, and for beginners learning how to build a plan. It is effective against opponents who play automatically and let White get Ne5 and a kingside attack. It is least effective against well-prepared opponents who hit the centre early with ...c5 and ...Qb6. More ambitious players often move on to the Queen's Gambit or mix both.

The numbers

On this exact line Lichess shows White at 51–52.5% and Black at 43.5–44.5% below 1800. At higher levels it is 47.5–49.5% for White against 44% for Black. In master games over the board, the London is very balanced: White wins 27%, Black 24% and 49% are drawn.