Scandinavian - Marshall variation
1. e4 d5 2. exd5 Nf6 3. d4 Nxd5
White plays the king's pawn to e4. Black advances the queen's pawn to d5. White captures on d5 with the king's pawn.
Black develops the knight to f6. White moves the queen's pawn to d4. Black captures with the knight on d5.