The players acquired by Fletcher matured into one of the strongest teams in the NHL during the mid-1980s and early 1990s. From 1984–85 to 1990–91, the Flames tallied 90 points in every season but one. However, they were usually unable to transform that success into a deep playoff run, largely because they could not get the better of their provincial rivals, the powerhouse Edmonton Oilers. The Oilers and Flames usually finished at or near the top of the Campbell Conference and were usually among the best teams in the entire league during this time. However, the NHL's playoff structure of the time made it very likely the Flames would meet the Oilers in either the first or second round, rather than in the Campbell Conference finals. That same structure made it very likely that the other two playoff qualifiers in the Smythe Division would have to get past the Flames or Oilers (or both) in order to make it to the conference finals. From 1983 until 1990, either the Oilers or the Flames represented the Campbell Conference in the Stanley Cup Finals. By 1986, the Flames landed forwards Doug Risebrough, Lanny McDonald and Dan Quinn, defenceman Al MacInnis and goaltender Mike Vernon. Finishing second in the Smythe with a 40–31–9 record (the only season from 1984 to 1991 in which they did not finish with 90 or more points), the Flames swept the Winnipeg Jets in the first round of the playoffs, setting up a showdown with the Oilers. Edmonton finished 30 points ahead of Calgary during the season, and was heavily favoured to win a third Cup in a row. However, the Flames upset the Oilers in seven games, the only time the Flames defeated the Oilers in a playoff series in the decade. The series-winning goal came when an errant clearing attempt by Steve Smith ricocheted off goaltender Grant Fuhr's leg and into his own net. The goal remains one of the most legendary blunders in hockey history.