Nothing wrong with it, it's a good gambit. 
White has the initiative and should materialize it during the middlegame. Btw the ChessOK evaluation of the last position is +0.00.
French Defense, Horwitz Attack main line
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Jul 17, 2017
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#2
I usually like to play as many different variations as possible, to make the games more diverse. In one of my daily games, I played the Horwitz Attack, about which I only knew that it started with 1. e4 e6 2. b3. After 1. e4 e6 2. b3 d5 3. e5 I decided to look up the theory and was very surprised to see that in the main line white sacrifices the pawn, which black then gives back:
White gets the pawn back and things look pretty good. However, I was also looking at the lines in which black holds on to the extra pawn, and I simply don't see how white's positional compensation for the pawn is anywhere sufficient. For example:
Black's position looks fine, and engines give preference to black as well. Why isn't this the main line for black and what is wrong with it?