FILE - In this Dec. 27, 1956, file photo, Boston Celtics' Bill Russell (6) reaches for a rebound in an NBA basketball game against the Rochester Royals in Philadelphia. Stephen Curry and the Golden State Warriors are trying to to join Russell's Celtics, the Bulls led by Michael Jordan and the Lakers‚Äô trio of title runs fueled by George Mikan in the 1950s, Magic Johnson and Kareem Abdul-Jabbar in the '80s, and Shaquille O'Neal and Kobe Bryant nearly 20 years ago as the only franchises in NBA history to capture three championships in four years. (AP Photo/Sam Myers, File)