Leading 4-2 after 40 minutes, Florida's two-goal lead evaporated in the third period, starting with Alexandre Fortin's shorthanded goal at 9:52 to get the Blackhawks's within one. Then, with less than two seconds left in regulation, Alex DeBrincat scored to make it 4-4 and force overtime.
"We didn't give them anything in the first 20 minutes," Panthers captain Aleksander Barkov said. "We were leading 2-0. Then we just gave them opportunities, gave them chances, let them play their own game. We just kind of sit down and watch them play. It's been happening the whole season. It's got to stop right now."
In overtime, Gustafsson scored the game-winner to end Chicago's eight-game losing streak.
"We were a second away from it tonight, from getting two points," Panthers coach Bob Boughner said. "You don't get that opportunity at home on a nightly basis. It's tough to give up those goals, but we'll figure it out. It wasn't for a lack of guys not competing or playing hard. I thought we had a lot of compete."
The Panthers (8-9-4) will continue their eight-game homestand on Monday against New Jersey.
"Tonight, we sort of beat ourselves," Boughner said. "It hurts. It's something we're going to have to deal with as a team. We're going to have to look at it, we're going to have to learn from it and we're going to have to get better."
Here are five takeaways from Saturday's loss in Sunrise…