The Stampeders' 1983 season is best remembered for an upset loss at home completed in the last three minutes of the campaign that not only kept them out of the playoffs, but deprived Calgary of an opportunity to dethrone their bitter archrivals who were the five-time defending Grey Cup champions.
With the cross-over rule not yet in effect, the Eskimos could thus only watch helplessly as their provincial rivals hosted the long-eliminated 4-11 Saskatchewan Roughriders needing only a tie to end Edmonton's season.
Since no overtime format was yet in force for the CFL regular season, Calgary at that point only needed to hold Saskatchewan to a field goal to reach the postseason.
On their ensuing drive, which crucially included a successful third-and-eleven conversion from well within the field goal range of Saskatchewan kicker Dave Ridgway, the Roughriders scored a touchdown with 27 seconds remaining in the game.
[1] Ultimately however, the Stampeders' miscue extended their rivals' dynasty by only one week as the Eskimos were throttled 49-22 by the Winnipeg Blue Bombers in the Western Semi-Final.