The Oilers defeated the Flames in the playoffs in 1983, 1984, 1988, and 1991, on their way to two of their five Stanley Cups. The Flames defeated the Oilers in the 1986 NHL playoffs; game 7 was decided when rookie Oiler defenceman Steve Smith accidentally scored on his own goal, which pushed the rivalry to a new level. The Flames were favoured in the 1988 playoffs, having won the Presidents' Trophy, but the Oilers swept the series and eventually went on to win the Cup.