Queen's Pawn Game: Accelerated London System, Steinitz Countergambit: what should White play?

In the Queen's Pawn Game: Accelerated London System, Steinitz Countergambit, White faces pressure against the d4 and b2 squares. The standard and most reliable response is Ngf3, which develops the kingside knight to its natural post and bolsters control over the center. White may also contest the queenside directly with Qb3, but Ngf3 remains the preferred foundation for smooth piece coordination.

Theoretical significance of Ngf3

Selecting Ngf3 represents the primary theoretical direction, appearing in 64.4% of recorded games (149K recorded) with an engine evaluation of -0.11. By developing the kingside knight, White completes a core tenet of the London setup while keeping options flexible regarding queenside defense. In practice, White scores 48.4% from this position. An illustrative continuation demonstrating the queenside tension is Ngf3 Qb6 Nh4 Bd7 Qb3 c4, where White actively seeks to displace Black's light-squared bishop.

The alternative counter-pressure with Qb3

The most significant alternative is Qb3, selected in 31.8% of recorded games (74K recorded) with an evaluation of -0.08. This move immediately meets Black's potential queenside threats by neutralizing the diagonal and attacking b7, yielding White an overall score of 53.8%. Play frequently leads to positional maneuvering after Qb3 Qd7 Ngf3 c4 Qd1 e6, as White resets the queen while Black solidifies the queenside pawn chain.

Minor sidelines: a4, Qa4, and Be2

Other continuations are seen far less frequently in recorded games. The engine rates a4 at -0.05, leading to the line a4 Qb6 Ra2 c4 Ngf3 h6, though its recorded-game count is unavailable. White can also attempt Qa4 (played in 0.7% of games, scoring 48.0%, evaluated at -0.10) with the continuation Qa4 Qb6 Qb5 Qxb5 Bxb5 a6, or develop quietly with Be2 (chosen in 3.1% of games, scoring 46.0%, evaluated at -0.18), leading into Be2 Qb6 g4 Bg6 g5 Nd7.