Black apparently gains a queen-side majority, as well as full compensation. See the full treatment here:
http://en.wikipedia.org/wiki/Danish_Gambit
Danish Gambit Accepted 5...d5?
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Feb 26, 2009
0
#3
Wait...it's that e pawn...isn't it? That is what Black is trying to deal with...am I right?
Here's the line
Feb 26, 2009
0
#5
Niven...that is not by any means a full treatment. I already read that article 3 times two days ago and it has nothing at all to explain individual moves. I didn't ask for what occurs in the Danish Gambit as a whole...I asked about the intention behind a specific move.
5...d5! is probably the refutation of the gambit. As OMGdidIrealyjustsact correctly said, Black offers back a pawn in exchange for a tempo to develop. Having a two pawns advantage isn't a sufficient compensation for such an undeveloped position at all.
I'm sure the answer is very simple but I just don't see it. In the mainline or I guess what they call the Schlecter line.. After:
3.c3...dxc3
4.Bc4...cxb2
5.Bxb2
then 5...d5 What is the deal with that? I've been looking over and over and maybe my brain is tired but I don't see it. Is it so the knight can attack the bishop before it carries out its plan anyway? No idea.
6.Bxd5...Nf6