Queen's Pawn Game: London System, with e6: what should White play?

In the London System after Black's early pawn advances, White's most reliable and standard continuation is e3. This move solidifies the central d4 pawn, opens diagonal mobility for the light-squared bishop, and keeps an engine evaluation of +0.07. As the overwhelming choice in opening databases, e3 appears in 68.1% of recorded games (2.69M recorded), with White scoring 53.2% of points.

Strategic aims of e3

The main purpose of e3 is completing the classic London pyramid structure while safeguarding the active f4 bishop outside the pawn chain. In the illustrative engine sequence e3 Nf6 Nbd2 Qb6 a4 Nc6, White develops methodically while preparing to contest central squares and stabilize the queenside against active piece pressure.

The alternative setup with c3

The second most frequent option is c3, chosen in 23.3% of games (919K recorded) with an evaluation of +0.03 and a 53.3% score for White. This move bolsters d4 directly and prepares an eventual harmonious setup via c3 Nf6 e3 Bd6 Bb5+ Nc6, transposing toward typical closed London formations. Both e3 and c3 account for over 91% of all games played from this tabiya.

Deviations and early central releases

White can opt for immediate contact or alternative piece development, though these variations score lower overall. Liquidating the center with dxc5 occurs in 4.7% of games (185K recorded, engine eval -0.05, 48.7% score), continuing dxc5 Bxc5 e3 Nf6 Be2 O-O. Less common tries include c4 (1.6% of games, eval -0.14) and the knight sortie Nc3 (2.4% of games, eval -0.15), both of which step away from traditional London System pawn structures.