# Grob's Attack

Grob's Attack, or the Grob Opening, is an unconventional chess opening in which White begins with the move:
    1. g4
It is widely considered to be one of the worst possible first moves for White. International Master (IM) John Watson writes, "As far as I can tell, 1 g4 is competitive with 1 h4 for the honour of being White's worst first move. Against an informed or skilled opponent, it is simply masochistic."

## History and usage

The opening takes its name from Swiss IM Henri Grob (1904–1974) who analysed it extensively and played hundreds of correspondence games with it. In Grob's newspaper column analysis of this opening, he referred to it as the Spike Opening, a name which is still used occasionally. Other early references used the name Ahlhausen's Opening, after Carl Ahlhausen (1835–1892) of Berlin, one of the first to play 1.g4. Savielly Tartakower sometimes played this opening in simultaneous exhibitions and called it the Genoa or San Pier D'Arena Opening, after the city and suburb of Genoa where he first used it.
Along with several other uncommon first moves for White, the Grob is classified under the code A00 ("irregular openings" or "uncommon openings") in the Encyclopedia of Chess Openings. White has three main plans: to support the g4-pawn with h3; pressure against d5 or on the h1–a8 diagonal, preventing Black from playing ...Bxg4 (e.g. 1.g4 d5 2.Bg2 Bxg4 3.c4, exploiting the pin against the b7-pawn); or advancing the h-pawn in a kingside attack.
Perhaps the highest-profile game to feature the Grob was when Michael Basman defeated grandmaster John Nunn with it in 1978. The Grob was also forced upon Anatoly Karpov by former Soviet premier Mikhail Gorbachev in a friendly match against Susan Polgar in Lindsborg, Kansas 2005. Gorbachev made the ceremonial first move and played 1.g4. Normally players can simply retract ceremonial moves they do not like. In this case Gorbachev insisted Karpov play on, saying he wanted to "cause some difficulties for the older player".
The Grob was included in the opening book for the superfinal of the 12th Top Chess Engine Championship season (April–July 2018). Both finalists, Stockfish and Komodo, evaluated the position after 1.g4 as providing a clear advantage for Black, and both failed to defend the White position.

## Responses

IM Michael Basman and Grandmaster Spyridon Skembris are advocates of the opening. It has a certain surprise value, and the average player is unlikely to know how to refute it and more likely to get overconfident and make mistakes. Moreover, the lack of theory along this line may negate the repertoire of an experienced opponent. Intuitive play by Black can lead into dangerous traps. Many of these traps rely on Black's replying with 1...d5, attacking the pawn with his queen's bishop. White can sacrifice the pawn with 2.Bg2 Bxg4 3.c4 with Qb3 to follow, giving White some pressure against the weakened squares d5 and b7.
Black is not obliged to give White these opportunities. In response to Grob's Attack, Black may also play 1...e5. Good responses would be 2.Bg2 (dominating the light-squared centre diagonal) or 2.c4, the English Variation, preparing Nc3 to solidify White's control of d5. After 1...e5, Black can take aim at the h4-square, left weak by White's pawn advance. 2.Bg2 h5 will force a weakening of White's pawn structure. 2.d3 (intending to answer 2...h5 with 3.g5) or 2.h3 can be answered by 2...Ne7 with the threat of ...Ng6 followed by ...Nf4 or ...Nh4, disrupting White's kingside fianchetto.
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Another frequently used setup for White in the Grob is 1.g4, 2.h3, and 3.Bg2. A Black counter-setup might be 1...d5, 2...e5, and 3...c6 (these moves may be played in any order), which, if used in conjunction with an eventual ...e4, negates White's king bishop's influence over the centre. IM Richard Palliser advocates instead the classical setup 1...d5, 2...e5, 3...Nc6, on the grounds that White is more likely to be familiar with the "reversed French" lines after 3...c6 4.d4 e4 5.c4 etc.
A key element of the Grob is deploying the king's bishop on g2 and having it rule the diagonal. In order to further this goal, White must keep the centre clear of pawns. This leads to frequent "tearing at the centre" with c4 often being White's third move.
Due to the unusual pawn structure White attains by playing g4 and c4 so early in the game, there is frequently little advantage to castling. Play often devolves into a wild and wide-open game, with a definitive advantage usually resolving itself in the first 20 moves.
Responses other than 1...d5 and 1...e5 are rarely encountered in serious games, though some such as 1...c5 and 1...Nc6 are reasonable.

### Critical Lines In Engine Play

Leela, Stockfish, and Komodo have all failed to hold the Grob against engines of similar strength.
After 1.g4 d5 white has five main moves;
* Bg2, pressuring the h1-a8 diagonal.
* c4, preparing Qb3xb7 and undermining d5.
* g5, moving the pawn out of harm's way.
* e3, leading to French-type structures.
* h3, defending g4.
2. Bg2 or g5 is played in the vast majority of games as e3 and h3 surrenders the initiative and leads to inferior versions of more common openings. 2.c4 usually transposes to 2.Bg2 main lines but does give both Black and White a few options for unique sidelines.

#### Grob's Gambit, 2.Bg2 Bxg4 3.c4

Against the Grob Attack's main line, Stockfish has opted to keep the initiative by giving back the b7 pawn as Black. After the moves 3... c6 4.Qb3 e6 5.Qxb7 Nd7 Black has gained a secure King and lead in development.
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Due to White's overextended Queen and general lack of coordination, Black retains a potentially decisive advantage. c6 is a poisoned pawn as Qxc6 would be met by Rc8 and Rxc4.

#### 2. g5 Gambit

An alternative attempt to save White's game is to gambit the d4 pawn in exchange for rapid development with 1.g4 d5 2.g5 e5 3.d4 exd4 4.Nf3 c5. This line has been explored in a widely cited theoretical correspondence game on the TalkChess forum.
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However, after 5.Bg2 Ne7 6.c3 dxc3 7.Nxc3 Nbc6 8.0-0 d5, Black still retains a possibly decisive advantage.