How it happened: The Blackhawks fell behind 3-0 over the first 21 minutes as Erik Condra (short-handed), Cody Ceci and Milan Michalek beat Blackhawks starter Antti Raanta. The Michalek goal came at the 23-second mark of the second period. The visitors battled back with two goals in the second while outshooting Ottawa 23-5. On the power play, Patrick Sharp converted a Jonathan Toews pass to beat Senators goaltender Craig Anderson. Raanta drew an assist on the goal. With 41 seconds remaining in the period, Marian Hossa scored off a brilliant solo effort to bring the Blackhawks with one. Hossa picked off a Marc Methot pass, beat defenseman Erik Karlsson and banked a backhand off the pads of Anderson, just inside the post. The Senators added two in the third, from Kyle Turris on the power play at 6:00 and Clarke MacArthur at 10:54. Brent Seabrook scored a short-handed goal at 17:00.
What it means: With the loss, the Blackhawks remain second in the Central Division with 99 points, eight behind the St. Louis Blues and one ahead of Colorado. Chicago's record falls to 11-2-3 in the second game of back-to-back series. The Blackhawks have dropped three of the past four games, including shutout losses to Boston and Nashville. Center Marcus Kruger played in his 200th career game. Kruger entered the game ranked fifth in the NHL with a 57.3 faceoff percentage, tops on the team. The Blackhawks split the two-game season series with the Senators. The first was a 6-5 Chicago victory at the United Center on Oct. 29 featuring a hat trick by Toews.
Player of the game: Anderson, a former Blackhawks goaltender and native of Park Ridge, Ill., stopped 46 of 49 shots, including a pad save to rob Andrew Shaw on a rebound attempt.
Stat of the game: Duncan Keith was minus-3.
Rough debut: In his first NHL game, winger Matt Carey saw a shot deflect off his skate for Ottawa's second goal, then took a faceoff delay-of-game penalty, and sat in the box as the Senators scored their fourth goal.
What’s next: The Blackhawks play their fourth game in six days when they visit the Pittsburgh Penguins on Sunday, the finale of a three-game road trip. The team returns home for a few days off before facing the Minnesota Wild on Thursday at the United Center.