411 REFERENCE · Wikibooks
Chess Opening Theory/1. g4/1...d6
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Grob's Attack
1...d6
Black attacks the g4-pawn with the bishop. White should ignore the attack and play /2. Bg2/, because after 2... Bxg4?! 3. Bxb7 Nd7 4. Bxa8 Qxa8 White is up one point of material but Black has their queen on an active square and is threatening to capture White's rook on h1.
Protecting the pawn with /2. h3/ is another good choice.