University of Regina's Emma Waldenberger scored 1:08 into overtime to lift the Cougars 3-2 over the University of Saskatchewan Huskies Friday night in Saskatoon's Rutherford Rink.
Brooklyn Moskowy's pass from centre ice found the streaking Waldenberger. Her quick shot from the right side slid past Saskatchewan netminder Cassidy Hendricks for the win.
After the game, both the Regina Cougars and No. 8 ranked Saskatchewan Huskies have 7-1-3 records.
Special teams proved to be the difference with four of the five goals scored in the game coming on the power play.
After the first period solved nothing, the Huskies and Cougars traded three goals in the second frame.
Moskowy opened the scoring in the game at 6:31 on the power play after Chelsea Sundby was caught for hooking. Just five seconds remained on the power play when the Cougars scored the goal. Just one minute later, Caitlin Dempsey gave the Cougars a 2-0 lead with another power play goal.
Reigning CIS Rookie of the Year Kaitlin Willoughby cut the Cougars lead in half at 13:50 in the second period again on the power play.
Saskatchewan defenceman Julia Flinton tied the game at two at 13:50 on the power play with a hard shot from the point that Cougars goalie Toni Ross didn't see.
Ross finished the game making 18 saves in the win for the Cougars, while Hendricks made 20 saves in the loss at the other end of the ice.
The provincial foes will finish the second half of the home-and-home series Saturday in Regina.