Grob Opening
The Grob Opening starts with 1.g4, pushing the g-pawn two squares to prepare Bg2 and attack Black's queenside along the long diagonal. White hopes for quick tactics against b7 and d5, while Black takes the center with ...d5 or ...e5 and targets the loose g4 pawn and the weakened kingside.
- Moves
- 1.g4
- ECO
- A00
- Engine
- −1.27 · a clear edge for Black (Stockfish 17.1, depth 20)
- Played
- 12,113 games in our lichess sample
- White scores
- 51.3%
Key ideas for both sides
White
- Develop the bishop to g2 at once so it pressures d5 and b7 along the long diagonal.
- Play c4 to attack d5, aiming to open the diagonal for the g2 bishop.
- In the gambit lines, use Qb3 to hit b7 after Black takes on g4 with the bishop.
- Support the g4 pawn with h3 when it is attacked, keeping the kingside pawns together.
Black
- Take the center with ...d5 and attack the g4 pawn with the c8 bishop.
- Meet c4 with ...d4, closing the long diagonal and gaining space, as in the top engine line.
- Hit the kingside with ...h5 to break up White's pawns and open the h-file.
- Develop with ...Nc6 and ...e5, using a big center against White's loosened kingside.
Plans and pawn structure
The Grob is a dubious opening. The engine gives Black a large edge after 1...d5, and the main line 2.Bg2 Nc6 3.c4 d4 4.h3 e5 5.d3 shows Black with a big center and a closed long diagonal. White's play depends on tactics against b7 and d5, mostly with c4 and Qb3. Black's plans are simple: build the center, close the g2 bishop's diagonal with ...d4 or ...c6, and attack the weak kingside with ...h5.
What the Grob Opening is about
1.g4 is one of the most provocative first moves. White pushes the g-pawn two squares to put the bishop on g2 at once, aiming at d5 and b7. The cost is high: the g4 pawn is loose, the kingside is weakened, and short castling becomes risky.
The engine is clear. All three of its top replies, 1...d5, 1...Nc6 and 1...e5, give Black a large edge. In practice White scored 51.3% across 12113 games, because many opponents fall into the tricks. The Grob is a trap-based weapon, not a sound opening.
The main variations
The Grob Gambit, 1...d5 2.Bg2, is the main line. White ignores the attack on g4 and offers the pawn. The engine likes 2...Bxg4, and after 3.c4 c6 4.Qb3 e6 5.Qxb7 Nd7 6.Nf3 Black is better despite losing the b7 pawn. White scored 57.6% here, so the gambit works well in practice.
The Fritz Gambit, 2...Bxg4 3.c4, is the most common follow-up. White hits d5 and prepares Qb3 against b7. Black should answer with ...c6 and ...e6 to keep the center solid. White scored 60.1% in this line, mostly because Black players do not know how to handle the pressure on b7.
The Grob Gambit Declined, 2...c6, keeps d5 solid and avoids the tricks. The engine line 3.g5 h6 4.d4 hxg5 5.Bxg5 Qb6 shows Black hitting b2 and getting a clear edge. White scored only 49% here.
The Spike, Hurst Attack, 1...e5 2.Bg2 d5 3.c4, is the same idea against ...e5. Black can take with 3...dxc4 and develop with ...Ne7 and ...Nbc6, and the engine keeps a large plus for Black.
Typical plans for White
White's play is all about the long diagonal. The bishop on g2, the push c4 and the queen on b3 combine against d5 and b7. If Black takes on g4, White uses the time to attack the queenside.
- Hit d5 with c4. If Black's d-pawn leaves, the g2 bishop gets a clear path to b7.
- Use Qb3. The queen hits b7 and sometimes f7, especially after Black's bishop has left c8.
- Hold the kingside with h3. If Black does not take on g4, h3 keeps the pawns together.
White should avoid castling short too early, because the g-pawn's advance leaves the king exposed.
Typical plans for Black
Black's plan is to build a strong center and keep the long diagonal closed. With ...d5 and ...e5, Black controls the center, and ...c6 or ...d4 shuts the g2 bishop out.
- Take on g4 with the bishop only if you are ready for c4 and Qb3. A pawn on c6 and a knight on d7 defend b7 well.
- Use ...h5 to attack the g4 pawn and open the h-file. The engine line 1...Nc6 2.d4 d5 3.h3 h5 shows this idea.
- Develop quickly and castle long or short depending on how open White's kingside becomes.
Mistakes club players make
- Black grabbing g4 and then ignoring b7. After ...Bxg4, c4 and Qb3, the b7 pawn falls and White's pieces become active.
- Leaving the long diagonal open. If Black allows the g2 bishop to see a8, rook and pawn losses follow.
- White castling into the weakened kingside. With the g-pawn gone, the king is exposed to ...h5 and an open h-file.
- Panicking against tricks. Black is better in every main line; calm development wins most games.
Who should play it
The Grob suits White players who enjoy bullet and blitz and want to bring opponents into unfamiliar tactics. It is not a good choice for long games against prepared players, who will take the center and keep a clear edge.
Black players should learn one simple setup, such as ...d5 with ...c6, or ...e5 with ...d5, and the Grob becomes much less scary.
If you do play the Grob as White, know the main gambit lines well and accept that you are playing for tricks. Keep the king in the center or castle long when the kingside is open, and use the g2 bishop and the queen on b3 as your main attacking pieces. Against a calm opponent who closes the long diagonal, the position is simply worse, so be ready to defend.
What the engine plays from here
Stockfish 17.1 at depth 20 rates the position −1.27: a clear edge for Black. Its three top choices for Black:
- −1.27 1...d5 2.Bg2 Nc6 3.c4 d4 4.h3
- −1.00 1...Nc6 2.d4 d5 3.h3 h5 4.g5
- −0.91 1...e5 2.Bg2 Nc6 3.c4 h5 4.gxh5
Pawns, from White's side.
How it scores on lichess
12,113 rated lichess games reached this position; White scored 51.3%.
Light: White wins. Grey: draws. Dark: Black wins. About the sample.
Variations of the Grob Opening
- Grob Gambit1...d5 · 2,280 games
- Spike, Hurst Attack1...e5 · 1,014 games
- Alessi Gambit1...f5 · rare
- Double Grob, Coca-Cola Gambit1...g5 · rare
- London Defense1...e5 · rare
- Keene Defense, Main Line1...d5 · rare
How to play against it
As Black, take the center with 1...d5 or 1...e5 and don't fear the g2 bishop. Meet c4 with ...d4 or ...c6 so the long diagonal stays closed. Be careful with greedy captures like ...Bxg4 if you do not know the follow-up, because Qb3 and pressure on b7 are White's main tricks.
Questions
What are the moves of the Grob Opening?
The Grob Opening starts 1.g4. Its ECO code is A00.
Is the Grob Opening good for White?
Stockfish 17.1 rates the position −1.27 at depth 20, which is a clear edge for Black. In 12,113 lichess games from our sample, White scored 51.3%. A tricky blitz weapon at best: it sets traps against careless replies, but sound play gives Black a clear advantage.
What is the main idea of the Grob Opening?
White pushes g4 to develop the bishop to g2 quickly and attack d5 and b7. The pawn move weakens White's kingside a lot, and Black takes the center and targets g4 and the loose squares around White's king.
What should Black play next?
The engine's first choice is d5, with Nc6 and e5 close behind. 1...d5 takes the center and prepares ...Bxg4 or ...d4, hitting the weakness White created on the first move.
Updated October 2026. Sources and method.