7...Qa5 and 8...a5 are indeed suboptimal moves. However, in the second position, 8...Qa5 (instead of 8...a5) looks okay to me and it might discourage the Yugoslav attack. The main line continues with 9. O-O d6 anyway. 
Is Avoiding The Yugoslav Attack With the Accelerated Dragon Antipositional?
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May 4, 2017
0
#2
If you don't like these positions, in the second option with 8.Bb3 there is a move 8...Ng4!? aiming to simplify the piece tension before any plan gets shape. If Qxg4 then Nxd4 recovers the material and drive the position in more simple strategicall waters...I say.
The real problem Black face with the accelerated Dragon is that it's difficult to find someone play 5.Nc3
May 5, 2017
0
#4
This is the opening that I probably know better than any other.
*7...Qa5 I see no reason for. Just castle, and don't try anything funny. Besides, if you play 7...0-0, you'll see if your opponent is one of the many players (some even quite strong players) who will play 8.f3?! or 8.0-0 and you can immediately equalize with 8...Qb6 or 8...Nxe4, respectively.
*9.0-0 after ...a5 is fine, but it does allow black to play 9...a4, leading to some theoretical lines that give white probably a slight edge, due to large activity. It's not supposed to make that much sense, since this is theoretical. 9.f3 is the most common continuation, BTW.
*After 9.0-0, I don't recommend 9...a4, but instead just 9...Ng4, more or less forcing 10.Qxg4 Nxd4 and black has a fine position, maybe a little passive, but it's fine still. Black will be able to grab the Bb3 in many lines, and the general idea is ...d6, ...Bd7-c6, ...Nd7-c5, ...Qb6, and ...Rc8, etc. Black wants an endgame.
*8...Qa5 is not the best, but it's OK for a black player who would like to outplay white by getting out of the heavily theoretical lines (some of which are nearly forced draws/very equal endgames after the main lines).
Sep 3, 2021
0
#5
Old thread, but I thought I'd add that it's worth taking the time to learn the Accelerated Dragon (if you are a Sicilian player) even if you will normally never play a Dragon willingly! That's because sometimes White tries to trick you by playing 2. Nc3, like a Closed Sicilian or Grand Prix attack, then playing 3. Nf3 or 3. Nge2, trying to force you into a Dragon (hoping you will blunder your way into a Yugoslav Attack!). But since White has committed his Knight to c3, he can no longer play the Maroczy bind against the AD, and may not be well versed on the Accelerated Dragon main line, giving you a potential perk if you booked up!
I don't think White should try the Yugoslav against the Acc. Dragon as Black can play d5 in one move
#6
Indeed, the whole point of the Accelerated Dragon is to play ...d5 in one move.
The most fearsome for black in the Accelerated Dragon is when white plays the Maroczy Bind 5 c4, which prevents ...d5
Even in the regular Dragon black is OK in the Yugoslav Attack.
https://www.chessgames.com/perl/chessgame?gid=1018626
As far as I know Black has two ways of stopping White from playing the Yugoslav attack in the accelerated dragon:
- play 7...Qa5
- play 8...a5
But both these moves don't look right to me. With 7...Qa5 Black is putting the queen on a square where it just gets in the way of Black's queenside counterplay. The queen on a5 only seems to create tactical reasons to force White to castle short. But when White does castle short this just looks like a dragon with a misplaced queen to me.
And then there's 8...a5 where Black is surrendering his natural counterplay with ...a6 and ...b5 to create a "threat" of ...a5-...a4 which isn't really a threat because White can just ignore it and castle. Then we just get a dragon where I don't see where Black's counterplay is coming from. ...d5 is very unlikely to be played and the e4 pawn can only be attacked so many times.
I'm no expert but to me it looks like Black is purposefully playing bad moves to prevent a position that might be even worse. But idunno maybe there are good reasons to play these moves. I just don't know what they are.