The NHL's Stanley Cup Final is now a best-of-three.
The St Louis Blues scored a pair of third-period goals to beat the Boston Bruins 4-2 in Game Four in St. Louis.
Ryan O'Reilly had two goals for the Blues, who evened the best-of-seven matchup at two games apiece.
Vladimir Tarasenko also scored, and Brayden Schenn's empty-netter sealed the St. Louis win.
Charlie Coyle and Brandon Carlo scored for Boston, which twice erased one-goal deficits.
Bruins captain Zdeno Chara took a puck to the face, leaving his status for Game Five in doubt. The series shifts back to Boston on Thursday.