Ruy Lopez - open - 6.d4 b5
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5
White pushes the king's pawn to e4. Black advances 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 moves the a-pawn to a6.
White moves the light-squared bishop to a4. Black moves the knight to f6. White castles kingside.
Black captures with the knight on e4. White moves the queen's pawn to d4. Black plays the b-pawn to b5.