I don't think it is. Why do you think this is the case?
The importance of d5?
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I don't think it's "much more" important... but it is fought over often, which makes sense. 1.d4 xx 2.c4 is a sensible not terribly dramatic way for white to contest black's center... whereas 1.e4 e5 2.f4 is in some superficial ways similar, but the difference in contesting e5 with f4, and contesting d5 with c4 is rather obvious. f4 contests e5 at the cost of counterplay against White's suddenly ventilated kingside. ... Whereas c4 contests d5 much more "safely" -- Queen's gambit vs King's gambit is just one example of this phenomena...
But in general is isn't imo that d5 is more important, rather it is a more attractive target, largely because of the difference between advancing c-pawns vs. f-pawns.
Jan 16, 2012
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#4
I think you may have read this quote?
"To be a professional chess player is to spend your life living out of suitcases and fighting for control of the d5 square."
The reason d5 is more "important" is simply becuase it is a popular square of contestation in the sicilian, arguably the most popular opening in the world. It is also an important square in many other opening lines such as the queen's gambit, as pointed out above.
Whether or not "important" is the correct word is debatable. Certainly in these sicilian lines, the d5 square is more important than any other central square, but of course d5's importance is dependent on the board position. I would not agree that all center squares are equally important because, for example, d4 is rarely a square that people fight over.
Play the French and attack d4 with ferocity...
Jan 16, 2012
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#6
I think the reason is that in e4 or c4 as an opening, if White controls d5, Black doesn't have one of his big central breaks that can open up the position and give him some chances. But in general, the d5 fixation is a bit too vague to generalize about.
Can someone explain to me why d5 is so much more important to control than the other three center squares?