context: 1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... f8c5  4. a2a4 In the open sea that is the theory of the Italian Opening, this move is a breath of fresh air, albeit a small one, since the positions are so similar that only those who have studied dozens of hours can begin to understand the subtle differences. In my database, this is only the 13th most popular move. To give you an idea, even 4.Bxf7+ has more games played (although I didn't check for double games or games played on blitz; that would be too much).