Centaur hard to bs la,especially if you are a melee hero,try to
bs him when he's at half life,full life verry difficult,he might
even kill you..Queen of pain etc are blinkers its naturally harder
to kill them,unless you can disable them all the way or do some
megaass damage like finger or laguna..Try picking on intel and agil
heroes,i have a 90% success rate when backstabbing them.. 