Nieto shot over Smith's glove on a shorthanded breakaway for Colorado's first goal of the series and a 1-0 lead at 7:16 of the second period. It was his first goal in 40 games.
Smith, who shut out Colorado 4-0 in Game 1, made 44 straight saves to start the series, including Landeskog's breakaway deke 12:31 into the first period, a left pad stop on MacKinnon's shot from the slot on the power play at 14:45 of the first, and a glove save on Matt Calvert's shorthanded attempt 1:06 prior to Nieto's goal.
"Smith has had two really good games and he's a good goaltender, but we as a group felt it was just a matter of time before we'd break through," Landeskog said.
Andersson tied it 1-1 with a power-play goal at 12:26 of the second when he one-timed a no-look, backhand, backdoor pass from Sam Bennett.