BPaulsen wrote on 12/02/11 at 02:08:24:
13...Bd5 is just one option in that position, I feel white should definitely be better after it. 13...Nc6, or 13...Qc7 are both interesting.
9...Nh5 10. a4 has been my preference in analysis. Black seems to be on kind of shaky ground in the games I've seen with it. Granted, some concrete analysis should still be done, but my initial impression is that since the Bg3 is basically white's worst piece, black's "threat" to exchange it doesn't cause that much worry.
10.a4 must be critical I guess, in analogy with the positions with Be2 and ...Bb7 played. White most often has opted Be2 anyway, which leads to the question is if Black has something more useful than ...Bb7, like answering a4 with ...a6, or ignore it, and after axb5 play ...c5. Kinda the same as in the Meran, where it isn't always necessary for Black to play both ...a6 and ...Bb7 early on.
The thing I have found with these very messy positions is that what seems fine on "ordinary" chess terms is not always the best. Even if Bg3 is White's worst piece at the moment, Black might still want to chop it of based on long-term prospects after a possible opening up of the position (e.g. after ...c5), based on the dark-square weaknesses on the kingside, and based on the devaluation of White's kingside. For tactical reasons White often has to play hxg3, which also takes away the possible h4-break.
It does seem like Black has the worse position in the "regular" anti-Moscow lines (with Be2 and Bb7 included) after ...Nh5, which means that all this goes to show that concrete analysis is needed for sure. I suspect White might be better after 9...Nh5, though, but it hasn't really been tested.
I'll have a look at this at home. Just wanted to get the idea of 9...Nh5 out there. Dreev doesn't really give it much attention, maybe because it is a minor line.