Midway through the first, the Caps took the lead. Evgeny Kuznetsov won a puck along the left wing wall in Buffalo ice, and he dealt a perfect feed to Jakub Vrana in the high slot. From there, Vrana drove a one-timer past Hutton to make it 2-1 at 9:41.
The Caps turned in a strong first 20 minutes but got stuck in the mud to start the second. For the second straight period, Kempny was boxed in the first minute, this time for a phantom hooking call. Eichel scored a brilliant rush goal on the ensuing power play, beating Copley on the short side high, seemingly putting the puck in a postage-stamp sized area to make it a 2-2 game at 2:25.
Less than five minutes later, Buffalo regained the lead with yet another extra-man tally at the expense of the Caps' beleaguered penalty kill. After assisting on each of Buffalo's first two goals, teenaged phenom Rasmus Dahlin scored from the slot at 7:21 to lift Buffalo to a 3-2 lead. It is the first three-point game of the 18-year-old blueliner's career.
With the two teams playing four skaters to a side in the back half of the middle frame, the Caps pulled even on Alex Ovechkin's seventh goal in a span of three games. Buffalo won a defensive zone draw, but Caps defenseman Dmitry Orlov made a good read, stepping up to pick off a soft breakout pass. Nicklas Backstrom collected the puck and fed Ovechkin in the high slot. From there, the Caps' captain wound up and drilled a clapper past Hutton to make it a 3-3 game at 13:46.
The Caps had the better of the chances in the third, but neither team was able to snap the tie. Buffalo's Sam Reinhart missed an empty net in the final minute of regulation during a late Sabres push, and when overtime failed to produce a winner, the Caps went to the shootout for a second straight night.
Ovechkin wasn't able to become the first player in league history to record hat trick in three straight games, but his shootout goal was the difference maker, and Copley sealed his seventh win of the season and Washington's 20th when he denied Jason Pominville in the skills competition to deliver a four-point weekend and a fifth straight win for the Caps.