Ruy Lopez - Exchange variation doubly deferred (DERLD)
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Bxc6
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 moves the light-squared bishop to a4. Black moves the knight to f6. White castles kingside.
Black develops the dark-squared bishop to e7. White captures with the light-squared bishop on c6.