The Flames lost their sixth consecutive game, the team's longest losing streak in seven seasons.
Niemi, although he remains a backup to Cristobal Huet, improved his record to 13-3-1 and has allowed less than two goals a game.
Jamie Lundmark scored against Niemi with 1:29 left in the second period to tie it at 1-1 but Ben Eager and Duncan Keith produced third-period goals. Chicago increased its lead over Nashville in the Central Division to 13 points.
Miikka Kiprusoff made 25 saves in the loss.
Copyright 2010 by United Press International.
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