Previously I played 7...a6, but wasn't too satisfied with it. So I switched to 7...Nc6, which is Yelena Dembo's suggestion. After 7...Nc6 it's probably best for white to continue developing with 8.Be2 and 9.Be3, but black should be at least equal in all variations.
Grunfeld: VOTE!
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I have comparitively recently adopted the Grunfeld Defense to my repetoire. The most annoying system againt it is, by far, the Russian variation. This is not because it is so good, but because there are so many ways to play against it, I don't know which to choose. I am therefore letting you, my loyal chess.com theoreticians, to decide for me.
I now have:
1. 7...Bg4, the Smyslov variation. Black will then play ...Nfd7 and...Nb6.
2. 7...Na6, followed by ...c5, the Prins variation
3. 7...a6 followed by ...b5, the Hungarian variation.
4. 7...Nc6, going to a5 later. I think it is dubious, but De Fermian disagrees. "This may well be black's best option against white's system. Black breaks down the white center with piece play." (MCO-15)
5. 7...c6
6. 7...b6