RE: "So there appears to be a consensus that Black can have a Petroff repertoire and reasonably avoid the Scotch."
and "I am not certain that 3...Bb4+ is so bad. " These sort of lines are part of the "Anti-Scotch" stuff I mentioned in my original post. They are "playable" or "reasonable" alternatives, but I just don't think they are as good. In fact, I think they're
demonstrably inferior to the Scotch mainlines.
They
are playable and not
bad moves; just not the
best moves.
For example, while 3...Bc5 is fine, it is less flexible than the rather more natural 3...Nc6. Besides, it is
still going into a Scotch after 4.Nxd4 since I would definitely go 4...Nc6 here (and if 5.Nxc6 Qf6!).
By the way:
3...Bc5 scores
36.3% 3...Nc6 scores
45.6% You can see that Black scores
much better with ...Nc6 than 3...Bc5. This doesn't
prove anything, of course, but I think it helps reinforce what I was saying.
So, as I first mentioned, if you play 1...e5 (even if you are aiming for a Petroff) you will need some Anti-Scotch, Anti-Two Knights stuff (unless you go for the mainlines). And since we were discussing "avoiding" theory, I assumed the original poster would rather avoid the mainlines.
RE: "I am less impressed by the second move order, since 3...Nxe4 4.Nc3 Nc6 is just fine for Black. " I only gave 3...Nxe4 4.Nc3 since its a popular choice. Apparently, I shouldn't have.
Sorry for any confusion, but as was said
"Of course 2.d4 exd4 3.Nf3 Nc6 4.Bc4 Nf6 is a Two Knights" .
Which was what I was referring to.
I was merely pointing out that I didn't believe in the 3...Nxe4 lines.
The main point was that you must either allow the Two Knights or work out your "Anti-Two Knights" theory, since you
could face it OTB.
When you play for the Petroff, you can still have to face the Scotch and Two Knights. If you avoid them, you need anti- lines.
I think we can agree to that now.
I faced
both the Scotch and the Two Knights at various times even when aiming for the Petroff. There
are playable side lines which I referred to before, but I think these lines are demonstrably inferior. However, if you do play them, you've got the "anti-Scotch" and "anti-Two Knights" stuff from the first post.
Anyway, I'll step aside now since the original point of this thread has been met. Apparently he decided that 1...e5 was less theoretical than 1...c6, and the Petroff is the way to play for the win (instead of the solid Caro-Kann).
So, there is no use going on about this trivial move order stuff anymore.
Cheers,
Nietzsche