The rivalry between the 76ers and Boston Celtics is the earliest dated rivalry in the NBA. The two teams have the most meetings in the NBA Playoffs, playing each other in nineteen series, of which the Celtics have won twelve. It is considered to be the second-greatest rivalry in the NBA, next to the Celtics–Lakers rivalry. The rivalry first peaked when Wilt Chamberlain and Bill Russell of the Celtics played each other from 1965 to 1968. The 1966–67 Sixers, voted the best team in league history during the NBA's 35th anniversary, set a then-record by winning 68 games in the 81-game season (a record since broken by the Lakers, Bulls and Warriors) and ending Boston's eight-year title reign which led to the infamous "Boston's Dead!" chants.