Alekine defense dead   I play it often myself because it results in really sharp lines. but wen my opponents rating is around mine or higher i will avoid it.

The further that a pawn moves from it's original square the hard it is to defend

I see what you are talking about here I would not call this a mistake by white. Instead, black and white are having a debate about "centers and space" that is as old as chess itself.

I am implying that this is a rare case where moving a piece twice in the opening is not bad.

I control everything from the 5th rank down and even influence the 6th rank strongly.

Well if you were white would argue that allowing white to control the center is a major problem. What I mean by "perceived" is that white's center is not as strong as he says.

4. c4?! Nb6 5. Nf3 d6

@elyhim: I thought the Voronezh variation (4.c4 Nb6 5.exd6 cxd6 6.Nc3 g6 7.Be3 Bg7 8.Rc1 O-O 9.b3) was considered good for White?

Many experts consider a pawn that can not be defended by another pawn to be a liability

doubled pawns on the d-file.

Not to mention isolated.

Maybe Bc4 was better, discouraging black's next move.

Jkarp, I am not just thinking about the immediate threat of 9. ...cxd4. I am also thinking about "potential" threats that many occur as a reason of my actions. In chess, most real threats have to be anticipated and dealt with in advance. Often, once the threat appears it is too late to deal with it correctly.

Maybe dxc6 Nxc6, Bb5 is good.

The isolated d-pawn is usually an aggresive piece early on, a space-grabber if you will, but toward late midgame, endgame is serves as a target.

Again I make a move now with my eye probing into the future. This is preparation for the attack