Recently, the 7. Qb3 line has gained popularity in the 4. Qxd4 variation of the Accelerated Dragon. Normally, white goes for 7. Qe4, but Qb3 is actually a tricky move. Instead of Nb6 as against Qe4, here the correct response for black is to go Nc7-e6. In this video, GM Perelshteyn explains how to face both 8. Bc4 and 8. Bf4.