Uh. If 5. ...Na5 is played then it isn't the Fried Liver at all, it's simply the most common variation of the Two Knights Defence.
Fried Liver Attack
The Fried Liver Attack is the move order:
1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.Nxf7
The Polerio Counterattack is the move order:
1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5
Where do people get all these chess games? Can someone tell me is there a huge database somewhere?
http://www.chess.com/explorer/ :)
And yes there are huge databases, some online, some commercial, some with over 4 million games.
Regarding your question about GM's view, the main reason they don't play Nxd5 with Black is because, as some already noted, they don't want to face the Loli (d4), which is much harder to defend against than the Fried Liver (Nxf7).
Yes I know about the game explorer on chess.com ( duh ) but I was under the conclusion that people were getting them from different websites.
The two knights defense is one of my favorite openings, I play it for both sides of the board and I try to keep up on any new theory on the two knights defense. Lately the have been some new developments.
First in the 5...Na5, the move 8.bd3, which is shown in a previous post, seems to give black alot of problems. If fact GM Roman Dinzicantspellurname, claims that 8. Bd3 refutes the the two knights defense. After watching his video on it and trying line myself I can't really disagree with him.
Second, Dan Hiesman recently published an artcile in chess life, claiming that 5...Nxd5 is actually sound. And also claimed the 6.Nxf7 whites best try for an advantage not 6.d4.
So now 5...Nxd5 is considered superior to Na5, and 6.Nxf7 is better than 6.d4.
@Dragec Yes you can call it the Traxler if you want
@eaglex I think you mean 4...Bc5 I don't think there is any line in any opening where white plays 4.Bc5
Chess.com public... prove me wrong!
@Dragec Yes you can call it the Traxler if you want
@eaglex I think you mean 4...Bc5 I don't think there is any line in any opening where white plays 4.Bc5
Chess.com public... prove me wrong!
The well known Ponzi-SideStorm Attack
Of course White has easier play OTB, and a lot of openings are like that (played in CC but not OTB). However, the Lolli attack, 6.d4, has long been thought to just be better than 6.Nxf7. But Black's Nxd5 is known to be an error...
It's more accurate to say it WAS known to be an error. An article by Dan Heisman was recently published in Chess Life, where he (or rather, Rybka) said ... Nxd5 is fine for Black.
Wasn't there a queen's-rook-odds game by Paul Morphy where he used the Fried Liver and could have finished the game with 0-0#? (Though he chose not to, instead just moving away his king to deliver discovered check.) I recall it was a pretty cool game.
Incidentally...
they don't want to face the Loli
I think you mean the Lolli. The Loli is something...quite different. 
Yes this is what I call the Traxler Defense
That is the main line Two Knights Defense. The Traxler Counterattack is the continuation 4.Ng5 Bc5
why is stopping your opponent from castling so important?
King safety depends, for a large part, on castling while queens are still on the board. Not so much once they are gone, though. Centralization of the rooks is also one of the objectives of castling, which allows for greater mobility and choice of open files.
The jury is still out on this one, neither side is thought to have the advantage. In openings like this, it's really the better prepared player will have the advantage
In real CC chess I think white is sometimes afraid to go into it.
In OTB chess I think black is the one who often declines by playing 5...Na5. If you head for this at a tournament...
orangehonda is 100% correct. 5...Na5 is the best and most common move.
Two examples of the Fried Liver Attack from famous chess players with 5...Na5
The Fried Liver Attack with the strongest rated player with the Black pieces that I could find playing 5...Nxd5. Black went on to win, and White was high rated as well.
I'll stick with 5...Na5!