In 2007 , GMs Kiril Georgiev and Atanas Kolev asserted that much the same was true of the so @-@ called Poisoned Pawn Variation of the Najdorf Sicilian , which arise after 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6 ! ? This have long been considered one of the sharpest and most problematic , or even foolhardy , opening lines . The game usually continue 8.Qd2 Qxb2 9.Rb1 Qa3 . Georgiev and Kolev stated that 6.Bg5 is seldom seen at the highest level because the main line of this variation lead , with best play , to a draw by perpetual check . They wrote that the following game " will probably remain the last word of theory " :