Hi Robbie,
The other lad has it correct from what I've seen when you play over games
with GM's or sit in on their analysis.
They recall positions from old games and the post game comments.
They have an organised memory, it's not cluttered up with opening lines.
That would be totally pointless, theory is in a constant state of flux.
Infact you would be surprised at what little they do know.
When they prep up for an opponent and their opponent takes a different
path they store it for another time, another place.
It's how TN's are born.
Yes if you have a tactical opening in your rep then you must be familiar
with all the tricks and traps, the reason some choose this rep is in the
hope their opponent does not.
BTW mate. here.
Black has 5...Nd5 and 5..b5 as perfectly respectable alternatives to 5...Na5
The MUST know variations happen one move before this position.
Instead of 4...d5 the move 4...Bc5.
The Wilkes-Barre.
In my book on the Two Knights I have written 'Don't get involved.'
And I don't, I know nothing at all about this line. Nothing.
I won't meet (I never play Ng5 and I play one of the above 5th moves as Black.
I recall Karpov faced it as White and played 5.Bxf7+ and Bd5.
Guess I'd do the same as White.
Finally falling for the Fries Liver attack. 5...Nxd5 and 6.Nxf7
Is not always fatal at our level. Black has 829 wins from here on RHP.