Ruy Lopez - exchange variation
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6
White plays the king's pawn to e4. Black pushes 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 captures with the light-squared bishop on c6.