The Edmonton Oilers currently trail the Colorado Avalanche by 3–0 in the Western Conference series. We know that there is a small amount of precedent for an NHL team to come back from such a deficit. However, as someone who would love to see a Canada-based team win the Cup and has been let down for nearly three freakin' decades, I am steeling myself for some cruel disappointment.
The ultimate heartbreak scenario for me would be that Edmonton wins the next three games and then loses Game 7. How often has this happened in NHL history? In other words, in what playoff series has the record been AAABBBA, where "A" means a win by Team A and B means a win by Team B?