Ruy Lopez - four knights (Tarrasch) variation
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Nc3
White pushes the king's pawn to e4. Black plays the king's pawn to e5. White develops the knight to f3.
Black develops the knight to c6. White develops the light-squared bishop to b5. Black plays the a-pawn to a6.
White places the light-squared bishop to a4. Black jumps the knight to f6. White moves the knight to c3.