how to kill the Ruy Lopez as black


4. Bxc6 is perfectly playable, if you know the lines. Unfortunately, the remainder of White's moves were not.

Bxc6 really is bad. That's why I play Bc4 instead and taking on e5 is just asking for trouble.
Why not just play the Italian game to start with?

Bxc6 really is bad. That's why I play Bc4 instead and taking on e5 is just asking for trouble.
Why not just play the Italian game to start with?
Not everybody plays a6. If the play continues Ba4 b5 The bishop ends on the diagonal anyway. Then there's the Marshall attack as well.