CHICAGO — The Chicago Blackhawks could have folded when they dropped three of the first four games of their series against the Detroit Red Wings. They could have packed it in when a potential go-ahead goal was waved off late in the third period.

They never did. They just kept coming.

Brent Seabrook sent a wrist shot over Jimmy Howard’s glove 3:35 into overtime, and Chicago completed an improbable comeback with a 2-1 victory over Detroit in Game 7 of its second-round playoff series on Wednesday night.

“We dug really deep,” captain Jonathan Toews said. “We came in here and asked ourselves a question: How bad we wanted it. You got your answer right there. That’s a heck of a way to pull out four wins in seven games.”

The Blackhawks, who had the best record in the NHL regular season, rallied from a 3-1 series deficit to reach the Western Conference finals against the defending Stanley Cup champion Los Angeles Kings.

For just the second time in NHL history, the final four teams remaining in the playoffs are the four most recent Stanley Cup winners. Chicago captured the Cup in 2010.

Seabrook picked up a loose puck and skated in on Howard through the middle of the ice, with Detroit defenseman Niklas Kronwall in front of him. Seabrook’s shot deflected off Kronwall’s leg before it sailed into the left side of the net for the defenseman’s first goal of the postseason.

“I don’t know if I saw it go in to be honest,” Seabrook said. “I just heard the horn going and the boys jumping out. It was a pretty exhausting game, but I think I was more tired during the celebration with guys jumping and pushing me in the face and dragging me down.

“It’s exciting. You don’t get to do that too many times.”