Even later in the first, the Caps got the lead back on a strong offensive zone shift. Eller did most of the heavy lifting, winning some board battles to retain possession and pushing the puck along to linemate Brett Connolly. Connolly fed Brooks Orpik at the left point, and the blueliner let a shot fly from there. The shot got caught up in traffic, but Eller pounced on it, firing twice. Smith stopped both, but Dmitrij Jaskin drove by and tapped in the rebound to restore the Caps' lead at 2-1 with 35.7 seconds left in the second.
In the first minute of the second, the Caps opened up a two-goal lead. Matthew Tkachuk tried to skate the puck out of Calgary ice, but lost the handle and Kuznetsov poked it away to Wilson. After an exchange with Jakub Vrana, Wilson fired a precision wrister from the top of the right circle to the top far corner of the cage, making it a 3-1 game just 54 seconds into the middle frame.
Calgary got that one back quickly, making it a 3-2 game less than a minute and a half later. T.J. Brodie's shot clanked off Calgary winger Garnet Hathaway and bounded behind Holtby to make it a 3-2 game at 2:17.
Washington had three power play opportunities in a span of seven and a half minutes over the remainder of the second, but wasn't able to add to its lead. The Caps poured five shots on Smith in those six minutes on the power play, they had some great looks and plenty of zone time, and shots from both Oshie and Carlson ring iron.
Holtby made a dazzling stop on James Neal from in tight early in the third, bailing out teammates whose turnovers had extended Calgary's stay in Washington ice. Nicklas Backstrom's line did a solid job of neutralizing the Flames' torrid top trio, but that unit struck to tie the game in the back half of the third.
Johnny Gaudreau surveyed and then fired from center point, and Elias Lindholm got a piece of it to deflect it by Holtby, tying the game at 3-3 with 7:59 left.
With just under two minutes left, Backstrom drew a holding call on Backlund, putting the Caps on the power play for the fourth time. A quick whistle scotched an immediate extra-man opportunity, but Kuznetsov came up with the game-winner off the rush, as Oshie just managed to stay onside.