 White suddenly is in deep trouble, with Black threatening 46...Qh1#.Had White appreciated the danger, he could still have drawn with 46.Qf1!Rg3+ 47.Kf2 Rxf3+ 48.Kxf3 Qxf1+ 49.Ke4 and with White's pawn so far advanced, Black has no better than a draw by perpetual check.