Chess Opening Theory/1. g4/1...e5/2. d3

Grob's Attack
a b c d e f g h 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 a b c d e f g h
Position in Forsyth-Edwards Notation (FEN) rnbqkbnr/pppp1ppp/8/4p3/6P1/3P4/PPP1PP1P/RNBQKBNR b
Moves: 1.g4 e5 2. d3
ECO code: A00

Grob's Attack

1. g4 e5 2. d3

d3 aims to open up the queen side bishop to attack Black's kingside, as well as support a future e4 for control of the center as well. It is basically trying to do two things at once, being hyper-modern as well as classic. Due to this as well as a weak kingside due to the advanced g pawn, White is at a disadvantage, being a jack of all trades, but a master of none.

With good play however, White can establish a mimicry of the King's Indian Attack, with the g pawn able to disrupt the king side knight if it ever comes to f6, meaning Black would have to play h6 to secure it, losing a tempo. Some common moves of this caliber for White include Nf3, Bg2, or the eventual e5, as well as the unique move of g5 common in many games of this opening to prevent Black's knight from moving there.

The main continuation for Black is to play d5, opening up the bishop to attack the g4 pawn, leading to g5. There is also the developing move of Nc6, which defends the e5 pawn and controls d4 along with said pawn.

Theory Table

Name	2	3	4	5	6	Evaluation	Notes/Explanation
Grob's Attack	d5	Bg2 Nc6	g5 Be6	h4 Qd7	Nc3 O-O-O	=/+	Black has the advantage with developed pieces and being on the queenside instead of the kingside, so more safe from a kingside attack. Meanwhile, White has only the bishop
Grob's Attack: King's Indian Variation	...	... ...	h3 Be6	Nf3 Bd6	O-O Nge7	=/+	Focus on playing a King's Indian Attack, try to solidify their own position.
	...	... Bxg4	c4 c6	cxd5 cxd5	Qb3 Nf6	=/+	Target the b7 square, pressure d5, force Black to be more passive so White can attack weak points