Okay.  I think I need an official ruling on this one.<br/><br/>Moving diagonally through difficult terrain counts as fifteen feet per square, which is two squares of diagonal movement.  Moving from N13 to Q16 would effectively be forty-five feet as a straight diagonal.  Theoretically, I should be able to move to N14 and then to O14 in just ten feet since it involves no stair climbing.  O14 to P15 is fifteen feet, counting for two squares of diagonal movement.  With the five feet of movement I should have left, would it be possible to throw an acrobatics check to jump the rest of the stairs and get in range to attack Ms. Fireball?