An instructive game:
How to deal with 4.Nc3 (Main line)


Finishing up on what the first diagram did not cover on dealing with Nc3:

Hey - sorry it took me so long to get round to this.
The analysis of 5... Nf6 is pretty comprehensive - good job! I can't see anything missing at all.
@ Gordon 1471: 5...d5 is the (other?) main line, and the one I play myself (as there are more traps to ensare White); it'll need its own "stickied" analysis post in due course. But, in brief, I think the idea that it belongs to the "romantic era" is a bit of an exaggeration - 5...d5 debuted in 1903, but has been played pretty regularly since then - it's perfectly fine for Black. It tends to be sharper than ...Nf6, in my opinion.
The main line runs 5...d5 6.Nxe5 dxe4. 7. Nxc6 Qg5, rather than ...Qd5. 7...Qd5? allows 8.c4 Qd6 9. Nxa7!, and White has a large advantage. But, as I said - that line will need its own post.

Thanks, Gordon1471 - I'm a bit busy this week, but I'll give it a look over at the weekend. In the meantime, you might want to look over Nigel Davies or Ivan Sokolov's analysis, if you have access to either. There's not much book on the Jaenish, though - it's one of our advantages!
logozar wrote:
Finishing up on what the first diagram did not cover on dealing with Nc3:
The more critical lines are covered here, so please read it all and don't skim it. I hope you enjoy!
This is all I know on how to play against Nc3. Feel free to add your own anylisis or ask questions, and if I learn more I will post it.
In sabbatino brunellos Book he gives 10 o-o o-o 11 d4 bd6 12 c3 be6 Leading to a slightly better Position which black can draw. Is this Variation already proved wrong?

Nc3 is the main line (Or the hardest one to face - d3 is usually played a bit more at club player level)
It is the most critical line so needs the most analysis.
How to deal with Nc3: