The Fried Liver Attack is a common and annoying attack used by white to gain a developmental and material advantage early in the game. I want to make the point clear that there are SEVERAL (less dangerous, probably) ways to counter it. However, I have this line is the most rewarding if played accurately. (I would put a visual representation here, but I unfortunately don’t know how to do that. Can anyone tell me how?) It starts 1.e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5… The point of the last move by white is create a dangerous fork between black’s queen and rook on f7, backed up by the bishop on c4. Here, play Bc5. Everybody is skeptical of this… “But, wait… can’t they still fork you???” Yes, they can. And that’s the entire point. After Nxf7, Sacrifice your bishop with Bf2+. White will almost always take the trade with Kxf2. Then play Nxe4+. Again, you put the king in check. The most common response is Ke3, as it’s considered a safe move. Here, save your queen from the fork and move it to h4. (Qh4). A common dubious mistake by white is to take the rook (“ooh, free material. Better take that!”) This is forced mate. 8. Nxh8 Qf4+ 9. Kd3 Nb4+ 10. Ke2 Qf2#. I hope you found this forum helpful. Please comment any insights you may have on the topic. As always, thanks! :)
Actually, the Fried Liver Attack is not common because anyone with common sense as Black won't allow it.
Contrary to popular belief of noobs, 4.Ng5 is NOT the Fried Liver. The Fried Liver is specifically the position after 4...d5 5.exd5 Nxd5?? 6.Nxf7.
Black can disallow this bogus by playing 5...Na5!! Instead of taking the pawn back.

The Fried Liver Attack is a common and annoying attack used by white to gain a developmental and material advantage early in the game. I want to make the point clear that there are SEVERAL (less dangerous, probably) ways to counter it. However, I have this line is the most rewarding if played accurately. (I would put a visual representation here, but I unfortunately don’t know how to do that. Can anyone tell me how?) It starts 1.e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5… The point of the last move by white is create a dangerous fork between black’s queen and rook on f7, backed up by the bishop on c4. Here, play Bc5. Everybody is skeptical of this… “But, wait… can’t they still fork you???” Yes, they can. And that’s the entire point. After Nxf7, Sacrifice your bishop with Bf2+. White will almost always take the trade with Kxf2. Then play Nxe4+. Again, you put the king in check. The most common response is Ke3, as it’s considered a safe move. Here, save your queen from the fork and move it to h4. (Qh4). A common dubious mistake by white is to take the rook (“ooh, free material. Better take that!”) This is forced mate. 8. Nxh8 Qf4+ 9. Kd3 Nb4+ 10. Ke2 Qf2#. I hope you found this forum helpful. Please comment any insights you may have on the topic. As always, thanks! :)