The Nelson Leafs will need another chance to eliminate Grand Forks after falling 3-1 to the Border Bruins on Tuesday.
Josh Williams made 26 saves and Michael Bladon had the lone goal for the Leafs, who lead the series 3-1 and host Game 5 on Thursday night.
Riley Smoler scored twice and Keaghan Holub had a single to keep the Border Bruins alive. Ross King got the start and stopped 43 shots.
The Leafs were missing Ryan Piva, who was suspended one game for a fight during Game 3. Dash Thompson and Zach Morey continue to be sidelined, although Sawyer Hunt made his return to the lineup.