For several years considered the best and enough to neutralize 12.Kb1. However, modern practice has proved that things are not easy for Black and he faces real difficulties in this line.
13.Bxc4 Rxc4 14.g4!
After 14.g4 Black has a lot of ways to continue. The main directions are:
A. 14...Qc7 provokes 15.g5 Nh5 16.Nd5, when the Black queen must retreat to d8. In spite of being played by Dragon experts Tiviakov and Alterman, this looks pretty dubious and in fact their results have been very bad in this variation. After 16...Qd8 17.Ne2 Be6 White's strongest continuation is probably simply to take on a7. Black has failed to prove any compensation in practice, see Bologan,V - Chatalbashev,B 1-0. Also possible is 18.Ng3 Bxd5 19.Qxd5 Qc7 20.Nxh5 gxh5 21.c3, with a slight advantage.
B. 14...Qa5 has little independent value. White must not play 15.Nd5?! Qxd2 16.Nxe7+ Kh8 17.Rxd2 Re8 with advantage for Black, but first 15.g5 Nh5 16.Nd5. Then Black is forced to play 16...Qd8, thus transposing into Variation Above (14...Qc7).
White also has a good additional possibility 15.Nb3. After 15...Qa6 both 16.e5 and 16.Bh6 give White better prospects, see Slobodjan,R - Malakhov,V 0-1 and Kaiumov,D - Solovjov,S 1-0.
C. 14...Qb8 leaves White with a wide choice of continuations, with the advantage in most cases, after 15.b3, 15.g5 or 15.h4.
D. 14...Re8 15.h4 is reminiscent of the lines starting with 12...Re8 B78 - 12.Kb1 Re8, where the quick ...Nc4 is not the best option for Black.
E. 14...b5 is often a typical reaction after g4. However, here the pawn f3 is not attacked by the knight from e5 and White can take on b5.The immediate 15.Ndxb5 allows Black to bring his king's rook to the queenside quickly with 15...Qb8 16.Nd4 Rfc8, with compensation, see Oim,T - Nesis,G 0-1. White has the much stronger 15.b3!, first met in Topalov,V - Tiviakov,S ½-½. The idea is that Black must retreat the rook back to c8, thus breaking the coordination of pieces on the back rank, since 15...Rc5 16.Ne6! is just losing for Black (for instance Tiviakov,S - Komljenovic,D 1-0). In spite of a draw in the above-mentioned game Tiviakov-Topalov, Black's position looked highly suspect after 15...Rc8 16.Ndxb5 Qa5 17.a4 a6 18.Nd5. Soon White players found improvements and it became clear that 14...b5 leads to difficult struggle for a draw. In fact White has more than one way to improve on Topalov-Tiviakov, in all cases with significant advantage, see Timoshenko,G - Rogozenko,D 1-0, Bologan,V - Fedorov,A 1-0, Bakre,T - Singh,S 1-0.
Instead of 16...Qa5, the somewhat strange move 16...a6 brought Black good results in practice. But they had little to do with the opening. After 17.Nd4 Black's compensation is not worth a pawn.