The contest went overtime because Atlanta right wing Mark Recchi tied it 2-2 with his sixth goal this season on the power play at 10:42 of the third.
Atlanta's other goal also came on the power play when Ilya Kovalchuk scored his 29th goal at 16:22 of the second.
Net-minder Manny Legace was beaten three times on 25 Atlanta shots for the Blues, had won their past two games.
On the power play, Atlanta went 2 for 4 and St. Louis went 1 for 3.
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