Syzygy wrote on 01/07/21 at 21:57:44:
The line with 22...Red8 was already seen in the correspondence game Hatzl - Moza 2014, which ended in a draw. The game continued 23. Bc4 Rac8 24. b4! axb3 25. Bxb3 Qxa3 26. Qd3, when Moza narrowly managed to defend against White's initiative with 26...Bf8. I agree that this is probably Black's best bet against 10. h3.
However, even if this entire variation is ultimately OK for Black, how should one meet 9. f3? The natural continuation 9...Bd7 10. Qd2 Nxd4 11. Bxd4 Bc6 12. O-O-O! or 11...a5 12. h4! looks quite dangerous both practically and objectively.
I see, that is interesting, thanks for sharing that game! I am not a corr-player and only have a few sources for correspondence games (Ultra Corr, CB-online plus some others), in which I could not find the mentioned game in this line. Further, the AD is not my main line, but I keep interest in it as I occasionally end up in it because I have played 1...c5 as a reply to 1.c4, or from 1. e4 c5 2. Nc3 Nc6 (not my usual answer, as I my main option is the Kan).
Thanks for pointing out 9. f3 as a dangerous alternative, which is pretty natural, as is the move 9...Bd7. Is this variation a reason for why there are no or few corr-games with 10. h3 lately?
Anyhow, I guess the critical continuation is 9...Nh5 10. Qd2, and it seems like Black has a decent game, choosing between 10...Qa5!? (which allows White to capture on c6 if he wishes) or capturing on d4 and playing ...Qa5 or maybe ...Be6 before that (which maybe can be said to be a more standard plan in the AD).
Edit: I just noticed that Shaw gives this line with 9. f3, and he recommends 9...Nh5 10. g3, with the comment that it's not clear what the knight is doing. This was also played in the game So-Mamedov, 2015. I think 10...Qa5!? looks best after that, as played in two email games, both ending in draws.