Ruy Lopez - open - 6.d4
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4
White plays the king's pawn to e4. Black moves 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 pushes the a-pawn to a6.
White places the light-squared bishop to a4. Black transfers the knight to f6. White castles kingside.
Black captures with the knight on e4. White advances the queen's pawn to d4.