Ankit Gupta wrote on 10/02/10 at 15:29:41:
He was being constructive; there's no reason to try to put him down for that.
Moves other than 2. Nf3 leave the scope of the Petroff. At most, we may suggest possible lines that Black should employ against other choices to keep in line with the style of the Petroff.
As for against 3. Nc3, the Four Knights leaves the scope of the Petroff and is entirely it's own opening. We have put a lot of work into reviewing 3...Bb4, and we believe White has no noticeable advantage in those resulting lines.
Thank you Ankit. For some reason I get put down a lot just for trying to help!
If your going to suggest lines Black should play against White's alternatives to 2 Nf3, here is what I would recommend:
Against 2 Nc3, I would recommend 2...Nf6 so if White plays 3 Nf3 the game transposes into your Petroff repertoire instead of 2...Nc6 where after 3 Nf3 one would have to learn some extra lines.
Against 2 Bc4, I would recommend 2...Nf6, which allows one line of the Italian Game with 3 d4 exd4 4 Nf3 Nc6 but after 3 d3 Black can avoid going into the main line with 3...c6, instead of 2...Nc6 which allows a direct transposition to the Italian Game with 3 Bc4.
Against 2 f4, I would recommend 2...d5 and in the main line 3 exd5 exf4 4 Nf3 Nf6, the solid Modern Defense, which avoids the more tactical lines of the King's Gambit Accepted and leaves Black at least equal instead of another solid line 2...Bc5, the King's Gambit Declined, which I think it slightly better for White.
Against 2 d4, I would recommend 2...exd4 and now:
a) 3 Qxd4 Nc6 4 Qe3 Nf6 5 Nc3 Bb4
b)3 c3 dxc3
c)3 Nf3 Bb4+! 4 c3 dxc3 5 Nxc3 Nc6, transposing to the Goring Gambit, 5 bxc3 Bc5, and 4 Bd2 Bc5
Even though these lines aren't that similar to the Petroff, I think these are clearly the best lines to go for and leave Black slightly better and 3 Nf3 Bb4+! also avoids going into the Scotch Game.