This opening came out of games played between chess clubs in England and Scotland. The English used it first, the Scots started using it after and since they eventually won the match it is called The Scotch. It begins with both sides advancing their king pawns. Then white brings out the king's knight putting pressure on black's king pawn. Black moves queen's knight to back up the contested black pawn. So far this is the same as the Ruy Lopez with concept of putting all the pressure on blacks advanced king pawn. It deviates from the Lopez and turns into a Scotch when white moves the queen pawn to add pressure directly to the blacks king pawn. This style is geared towards a player who prefers a quicker opening and wants to force exchanges. Here is the chess notation:

1. e4-e5
2. Nf3-Nc6
3. d4