how to continue "the fried liver defence"

The two knights defence goes 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 If white plays 4.Ng5

then black has 4...d5 5.exd5 Na5! 6.Bb5+   After this, I dont know how best to coninue. should c6 be played, or maybe blocking with the bishop. What do you think is the best continuation.

Both are very solid responses, but c6 is the generally accepted main line.

The Traxler (4...Bc5) is also another response to 4.Ng5

6. .... c6  7. dxc6 bxc6  8. Bf1 (one of a few choices).

btw... Not the "Fried Liver", this is "Mainline", Two Knights Defence.

Fried Liver:   5. exd5 Nxd5?!  6. Nxf7 Kxf7  7. Qf3+ Ke6 etc.

the fried liver itself actually occurs after 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7!?

Qf3 forks the King and the knight, forcing the King into the centre of the board

Here's another way for Black to play the 2KD, Hans Berliner uses Ulvestad's Variation to defeat one of the finest pre-computer era correspondence players:

Estrin was an expert on the 2KD (wrote a book on the opening) and multiple World Correspondence Chess Champion (also an OTB GM), so no mean feat.

thanks

I know that. Thats why instead of recapturing the pawn, Na5! is played, preventing the fried liver and the lolli, I think

Actually 5...Na5 is the Polerio Defense while 5...Nxd5 is the Fritz Liver Variation.

The Berliner variation is considered dubious with best play if not refuted.  Better is 8.Ne4 Ne6!

Even better for white is  8.cxd4! maintaining the advantage.

there is a very good lesson on chess mentor