Advancing the h-pawn against a fianchettoed kingside where Black is castled is a standard attack, especially in the Dragon Sicilian and Pirc Defense. When the h-pawn gets to h5, suddenly Black has the unpleasant choice of either messing up his pawn structure and exposing his king with ...gxh5, or allowing White to erode his 3 protecting pawns down to 2 protecting pawns after hxg6.
strong players could you please help expalin :1. e4 e6 2. d4 c6 3. c4 g6 4. Nc3 Bg7 5. Nf3 Ne7 6. h4
why engine in suggesting h4 on move 6?