What's wrong if white move to Castle long(0-0-0) in Accelerated dragon?
In the normal Dragon, the most dangerous system is the Yugoslav attack. Current theory shows that Black can resist the attack with a pawn sacrifice and maintain the balance. In the Accelerated Dragon, Black saves a move by moving the d pawn to d5 in one move. This allows Black to gain a dangerous initiative. With a Rook on the c file and the Bishops on g7 and f5, White must defend carefully.
After 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6, castling long as quickly as possible doesn't work for white: 7.Qd2 0-0 8.0-0-0 Ng4! 9.Nxc6 bxc6 and black is clearly better.
Therefore, if white wants to castle longside, he should start with 7.f3. After 7....0-0, 8.Qd2 is again dubious: 8....d5! and black has an extra tempo with respect to the normal Dragon.
Instead, white can prevent ...d5 by 8.Bc4. After 8....d6 9.Qd2 white has transposed to one of the main lines of the normal Dragon. But black has a more powerful alternative: 8....Qb6! and after 9.Bb3 he has 2 options:
- 9....Nxe4 10.Nd5! Qa5+ 11.c3 Nc5 (11....Bxd4 12.Bxd4 Nc5 is more ambitious, but also more dangerous (Baramidze-Motylev, Csiba-Sjugirov)) 12.Nxc6 dxc6 13.Nxe7+ Kh8 14.Nxc8 Raxc8, with an equal position
- 9....Ng4 10.fxg4 Bxd4 11.Bxd4 Qxd4 12.Qxd4 Nxd4, is an interesting alternative (Sulskis-Andrianov, Mikhailov-Chuprov)
[StartPly "12"] [FEN ""] 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.f3 (7.Qd2 O-O 8.O-O-O Ng4 9.Nxc6 bxc6) 7...O-O 8.Bc4 (8.Qd2 d5) 8...Qb6 (8...d6 9.Qd2) 9.Bb3 Nxe4 (9...Ng4 10.fxg4 Bxd4 11.Bxd4 Qxd4 12.Qxd4 Nxd4) 10.Nd5 Qa5+ 11.c3 Nc5 (11...Bxd4 12.Bxd4 Nc5) 12.Nxc6 dxc6 13.Nxe7+ Kh8 14.Nxc8 Raxc8
I don't play the Dragon, but it seems to me it is pretty good when you play the Accelerated form and push White into castling short. It offers White fewer offensive choices.
So, trying to castle long would still be the right ideal. It is only in the details that we see the flaws. The early Be3, f3 weakens Nd4, Be3 and pawn b2. The early Qd2 may allow ...Ng4. Using Bf1-e2 to guard g4 may allow an advantageous ...d5. An early f2-f4, to meet ...d5 with e5, may also leave Be3, Nd4 and pawn b2 too weak. White has to be careful in the opening to maintain safe coordination. See the early games like Lasker-(somebody whose name escapes me just now), Alekhine-Botwinnik, or Fischer-Reschevsky for examples of how crazy it can get.
1.e4 c5 2.Nf3 g6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4 O-O 8.Bb3 d6 9.f3 Bd7 10.Qd2 and White will castle queenside (probably on the next move). Note my comment about the necessity of playing this move order.