Grob Opening: what should White play?

In the Grob Opening, White faces a critical decision at the second move after the initial g4 has been met by the standard developing move Nf6. The most effective continuation for White is g5, which is the engine-preferred choice with an evaluation of +0.37 and the most popular response, appearing in 45.3% of the 397,323 recorded games. This move immediately challenges the f6 and forces Black to decide between retreating the piece or entering sharp, unconventional lines.

The primary line with g5

The move g5 serves as the main line of the Grob, aiming to disrupt Black's kingside development immediately. By pushing the pawn, White forces the f6 to move, typically leading to the sequence g5 Nh5 e4 g6 Nc3 Bg7. While this creates a target on g5, it also gains space and prevents Black from establishing a classical setup. Despite the aggressive nature of the push, the engine maintains that White holds a slight edge in this specific configuration.

Defensive alternatives for White

If White prefers to avoid the immediate confrontation of the main line, h3 is the second most frequent choice, played in 9.5% of games (38,000 instances). This move solidifies the g4 but results in a lower engine evaluation of -0.63, often leading to lines such as h3 e5 c4 d5 g5 Ne4. Another solid but passive option is e3, which appears in 3.1% of games and carries an evaluation of -0.62. These moves prioritize structure over the immediate tactical pressure found in the g5 variations.

The gambit approach with d4

A significant portion of players, accounting for 30.0% of recorded games, opt for d4. This move offers the g4 as a gambit to accelerate central control, though the engine evaluates this position at -0.71. The typical continuation involves Black accepting the pawn with d4 Nxg4 e4 d6 Be2 Nf6, where White compensates for the material deficit with rapid development and a strong presence in the center of the board.