Closed, Grob Attack

The Grob Attack is an early flank thrust in the Closed Sicilian. After 2...Nc6, White plays 3. g4, claiming kingside space and preparing Bg2 to add pressure on d5 without yet committing the f-pawn. The move loosens the kingside and is rarely seen. The engine gives Black a slight edge and prefers 3...h5, which questions the pawn at once. In practice 3...d6, 3...g6 and 3...e6 are the usual replies, and Lichess results are close to even.