Chess Opening Theory/1. e4/1...e5/2. d4/2...exd4/3. c3/3...dxc3/4. Nxc3

4.Nxc3
It's the Alekhine's choice. This move regains the one of the lost pawns, thus keeping White's material deficit to a minimum. White now has a huge lead in development and a half pawn center.