Chicago got off to an early lead as Aleksi Saarela tipped home a blast from Erik Gustafsson at the point at 7:20 of the first.
CHI@WSH: Saarela redirects home Gustafsson's shot
Washington tied it up to start what would become a back-and-forth second period, as Damien Riat beat Colin Delia in goal at 2:06 of the middle frame. Just over two minutes later, Nylander roofed a backhander following a Adam Boqvist shot from the point to put the visitors up 2-1.
Goals from Travis Boyd and Aliaksei Protas within 92 seconds of each other in the middle of the second gave the home team a 3-2 lead. That is until Boqvist circled the net and then put a shot in the far, top corner to tie the game 3-3 at 12:46 of the second period.
CHI@WSH: Boqvist roofs wrister from sharp angle
Deadlocked at 3-3, the game headed to overtime, where Tom Wilson scored the winner off the rush at 2:35 of the extra frame. The Blackhawks are back in action on Tuesday night as they travel to Detroit for a 6:30 p.m. CT puck drop. You can catch all the action on NBC Sports Chicago+, ESPN Radio 1000or streaming on NHL.TV and the MyTeamsApp