Grob Opening: what should White play?

In the Grob Opening, White faces a critical decision after the black knight occupies the d5 square. The engine-recommended continuation is c4, which carries an evaluation of +0.73 and has been played in 19.8% of the 76,359 recorded games at this position. This move immediately challenges the central knight and aims to seize space, leading to the main line c4 Nb6 c5 Nd5 d4 c6.

The Strategic Goal of c4

The move c4 is the most ambitious attempt to exploit the early placement of the black knight on d5. By attacking the knight, White forces Black to either retreat or support the piece, often resulting in a gain of tempo for White's central expansion. In the primary continuation c4 Nb6 c5 Nd5 d4 c6, White establishes a significant space advantage in the center while Black attempts to undermine the pawn chain.

Central Alternatives and Development

While c4 is the engine's top choice, other central advances are frequently employed. The move e4 is played in 11.6% of games, resulting in an evaluation of +0.36 and leading to lines such as e4 Nb6 a4 a5 d4 d5. Similarly, d4 offers a solid +0.35 evaluation and is seen in 5.8% of recorded encounters. These moves prioritize classical central control and development over the immediate tactical confrontation initiated by the c-pawn.

High-Frequency Knight Moves

Statistically, the most common responses in the database involve developing the minor pieces. The move Nc3 appears in 40% of the recorded games, carrying a near-equal evaluation of +0.05. This leads to a simplified structure after Nc3 Nxc3 dxc3 e5 e4 Bc5. Additionally, Nf3 is played in 50% of the relevant subset of games, maintaining a balanced evaluation of +0.02 and often transitioning into lines like Nf3 Nb6 d4 d5 a4 a5.