The Blues moved two points in front of Detroit at the top of the Central Division. The Blackhawks had won three in a row in their bid to secure a playoff spot. Chicago was in sixth place in the Western Conference going into Tuesday's game, but there were five teams within nine points of the Blackhawks.
St. Louis built a 3-0 lead through two periods, the key goal being the third one -- a shorthanded tally by Vladimir Sobotka early in the second.
Halak made 19 saves. Ray Emery gave up the five goals on 31 shots.
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