Lukas Reichel gave Chicago a 1-0 lead at 15:39 of the first period. He chipped the puck ahead as he entered the offensive zone, deked around Talbot and finished off a breakaway with a backhand in the crease.
Arvidsson tied it 1-1 at 4:37 of the second period with a one-timer from the left circle off a pass from Danault.
Quinton Byfield put the Kings ahead 2-1 at 16:04 with a power-play goal when he put in a cross-crease pass from Danault at the right post. It was his 20th goal of the season, becoming the youngest Los Angeles player to reach the mark since Kopitar in 2008-09.
“If he plays like he did tonight, he’s [going to] have a say in the series for sure,” Kopitar said of Byfield. “He’s been good all season. Yes, he’s had some down time the last few games, but he knows it. He knows what it takes. He’s been in a hard series last year, played a lot of minutes seeing the top matchups, and he knows. And I think this was a good indicator for him to see how he needs to play.”
Trevor Moore made it 3-1 at 17:24. Danault won the puck from Jarred Tinordi behind the net and fed Arvidsson below the left circle, who found Moore with a touch pass for a tap in at the right post.
“You’re always playoff ready,” Kopitar said. “It’s the best time of the year. We’re going in, it’s a blank page, and we start writing on it.”
NOTES: Kempe’s overtime goal was tied for the fastest in NHL history. He finished the season with 75 points (28 goals, 47 assists), becoming the first player other than Kopitar to lead the Kings in points since Jeff Carter in 2016-17. … The Blackhawks finished with 52 points, their fewest in a season where at least 70 games were played since getting 50 points in 1955-56.