which in my veiw is bad for white as it is telling the black player where to aim his pieces, i like castling do not get me wrong but its too early.

This is a very unusual line in the Sicilian, and it does have problems. It turns out that the bishop becomes something of a target on this square, allowing Black to carry out his thematic expansion on the Q-side (...a6, ...b5) with gain of time. 3.Bb5 is a playable line if White doesn't mind exchanging the B on c6 or d7. Otherwise, White usually waits (3.d4; 3.d3, 3.c3 or 3.Nc3 etc) before deciding where to place the LSB. In some lines the bishop does eventually get to c4...

The other downside of White's previous, though not so bad. The prelate's diet will henceforth comprise a deal of roughage...

Kingside pawnstorm from white vs queenside pawnstorm from black is pretty usual in the Sicilian. You shouldn't be so scared of one pawn move as to castle into a half open file.

Breaking the pin is a motivating factor as well.

This is a bad move. After 11.Ne4, d5; 12. Bd3, de4; 13.Be4 White stands better. The correct move is 10...d5 or 10...0-0

I agree with marinvukusic: with best play by white you gain nothing form this, and you get a very weak pawn on c6. Oh, and what's with the back rank talk? How could the queen be in danger?

The point being made here has to do with how White chooses to react to the knight's raid. For instance, White might try 11.Nxe4 d5 12.Bxd5 (selling his life dearly) 12...cxd5 and Black has a fine game with his central pawn majority. Probably this is what Black had in mind. But Marin rightly points out that White need not fall in so readily with Black's plan. After 11.Nxe4 d5 12.Bd3 Black has to take 12...dxe4 13.Bxe4 and now finds his Q-side under quite a bit of pressure. The d7-bishop won't be a very good piece for a while.

I like 11...Nc3 and 12...0-0. That way Black would ruin White's pawn structure (which is exactly the type of thing you are talking about).

With 11...Nxc3 you'd give white doubled isolated pawns and a weak a-pawn. I'd have played it in a second.

As would I, and followed up with a central advance (e.g. 11...Nxc3 12.bxc3 d5, followed by 13...c5, say). Black would have had a huge game. Mind you, even after the move played, Black's mobile central pawn majority is a big asset.

Castling is a good option here, I agree, and the weakness Black has observed concerning the g3-square is well spotted. But weaker still are the light squares about the WK. And don't overlook Black's really big trump: that central pawn phalanx. Here I would consider 15...e5 (as played) with 16...e4 to follow.

How isn't it a potential target? Your d7 bishop is directly attacking the h3 pawn.

Black could have taken a larger view. He's made his plan and is sticking to it, which makes sense. But it is always well to keep on the lookout for other opportunities, or features in the position that might suddenly become important. The h3-pawn was definitely a target, which made the ...e5 advance so effective. White can't afford to have his already vulnerable K-side further damaged. White's response looks as sensible as anything else he might have played here. Having said that, it would seem, then, that (from his remarks) Black is somewhat underestimating just how powerful a position he has already

Black's post-game evaluation looks sensible. It does look counter-intuitive to offer White's a2-bishop such a potentially useful open line. The d3-knight gets a useful square (e4) as well. Black seems to be gearing up for a K-side attack, or a central push. More relevant seems 17...e4, then.

Yeap, you've only managed to get his bishop and knight into play.

Black's advantage has been greatly reduced, one feels, but the extra pawn and the bishop pair ought to count for something. Black still retains an edge.

The "wasted tempo" doesn't matter that much. The fact that he can't benefit from opening the g-file, and that you're the one actually using it, that's way more important than any tempy. And that's why he shouldn't have exchanged knight vs bishop.