Although the main line is:
That's not the "main line", that's a different opening. The fried liver attack is a variation of the "two knights defense". What you're are calling the main line is a different (but related) opening called the "Giuoco Piano". Sometimes called the "italien game". I guess ignorance is bliss.
I got tired of reading all of the post by people trying to help you while you stubbornly ignored the truth of what they're telling you so I didn't read all of the posts. Just in case no one said this yet:
K vs K +B = DRAW
K vs K+R = WIN
I think you are confused please go get a openings book or look at the game explorer here on chess.com also work on your spelling, it's like a five year old did it.


K vs K+R = WIN
Special ability like giving a chekmate against a lone king actually means very little when deciding the general relative value of pieces: just think about the fact that K vs. K+2N is a draw while K vs. K+R is a win.