The first time I read about this system was in Gary Lanes book on the chigorin defense (1.d4 d5 2.c4 Nc6!? 3.e4?! The book is ideas behind modern chess openings:black. It's important to note that black can keep the pawn by dxe4 d5 nb8. My opponents never played these lines so I didn't pay much attention but good luck with your games.
Strong (?!) gambit against Nimzovich Defence
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As a notorious 1.e4 player you can hardly know the theory behind every Black defence, there are just too many possible defensive systems. In only a few games I've seen them play 1...Nc6, and till now I haven't bothered learning the theory for this because it happens so rarely that maybe it's not worth the effort. Of course there is nothing wrong with 1...Nc6, from an objective point of view: Develops a piece to a good square. Can't be bad in most openings.
The problem for White is that those few Black players who use 1...Nc6 know the theory behind this system way better and hence White will need much more time OTB to figure out strong continuations, which can eventually get them into time trouble in the more difficult middle game positions. And that will be where Black can often exploit their time advantage they got in the opening because they knew 1...Nc6 better.
Yesterday in a Blitz I've tried a novelty for White (according to the opening explorer), because I wanted to get the Black player out-of-their-book as quickly as possible. It's a somewhat dubious looking gambit, but they way things turned out in the game it seemed to give White a superior game.
Take a look, if you're an 1.e4-player then maybe you'll find this gambit idea attractive against 1...Nc6, too:
Comments on whether this gambit only worked out so well because Black defended inaccurately, or whether the basic idea behind the gambit (space advantage thanks to ...d5!) justifies the pawn sacrifice will help me to decide whether I should use it in OTB under long time control conditions in future games, too. In those very rare circumstances where Black plays 1...Nc6.
greetings