Spanish opening danger.

I am going to talk about a standard spanish opening.

It is a closed sicilian, with 5...Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 c5 11.d4.

In a normal level, it seems a solid opening to black. But white win a great majority of great masters's games.

Why?

I do not see a winner attack for white.

I don't see any winner attack either. Anyway I have played the closed Spanish many times with the white pieces and I like it, but since I am not a master and neither are my opponents I can't say whether the position is better for either side.

The attack is not immediate, but white will soon move his b1 knight to f1, followed by g3, and suddenly it becomes clear that every single one of his pieces is pointed at Black's king. Black has to look for counterplay on the queenside.