GREY'S ANATOMY - "Wishin' and Hopin'" - The race for the Chief's position is on, as the doctors compete for Richard's affections, a surgical patient endangers the lives of those around her, and Meredith's Alzheimer's-stricken mother, Ellis, experiences a change in her medical condition, on "Grey's Anatomy," THURSDAY, FEBRUARY 1 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/MICHAEL DESMOND) CHANDRA WILSON, KATHERINE HEIGL