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Conquistador

I have been a die hard 1.e4 e5 2.Nf3 for most of my chess life (except when I used to play 1.e4 e5 2.d4 when I was young).  Now, after solidifing most of my openings, I want to develop another weapon to use against e5 with the Vienna Game after 2.Nc3.  In my experience, I have seen:

1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 leading to the Frankenstein-Dracula Variation

1.e4 e5 2.Nc3 Nf6 3.Bc4 Bc5

2.e4 e5 2.Nc3 Nc6

What is the theory for the above mentioned lines and other crucial lines?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Myko41782

For the second diagram, white usually pushes f4 so Bc5 is a preventive move of sorts.