Reigning champion Tirinzoni only needed eight ends to beat the German three-player team, led by Daniela Jentsch in the afternoon draw.
The result locked Canada down for one of six playoff spots. By making the cup, Einarson, Val Sweeting, Shannon Birchard and Brianne Meilleur also secured an Olympic berth for Canada at the 2022 Games in Beijing.
Einarson finished their round robin with a 7-6 record, good for a tied fifth place with two sessions to go.
First-place Tirinzoni took the win, improving to 11-1.
The full playoff picture of the 14-team competition will become clearer later today. The round robin will conclude with the evening draw at the Markin MacPhail Center in WinSport.
“I can’t control what the other teams are doing on the ice,” Einarson said after his morning win. “I just have to hope and pray that we have a chance. “
Tie-breaking games are not used at this event. Instead, head-to-head records kick in with the results of the pre-match last stone draw.
In other early matches, Russia’s Alina Kovaleva took a 7-3 victory over American Tabitha Peterson, Dane’s Madeleine Dupont beat Scotland’s Eve Muirhead 9-5 and Germany edged Anna Kubeskova of the Czech Republic 9-8.
The Canadian team put early pressure on China and it paid off with flights. Yu rubbed a guard in the first end to give Canada a brace and Einarson stole a single in the fourth.
Canada stole another run in the eighth end and ran out of stones for China in the tenth to win it.
After a superb 1-5 start, Canada has returned to form in recent days to return to the .500 mark. China’s victory was desperately needed, even if it was just watching the scoreboard for the rest of the day.
“It was an absolute roller coaster,” Einarson said. “Sometimes we would dig ourselves in a hole and just fight. “
At the start of the morning session, Canada was one of seven teams with a chance to win one of three remaining playoff spots.
Switzerland’s Alina Kovaleva of Russia and reigning Olympic champion Anna Hasselborg of Sweden have reserved places earlier in the competition. Denmark (7-5) moved up to fourth place with their victory to lock in their place.
The Americans were tied with Canada at 7-6. Germany, South Korea’s EunJung Kim and Scotland were next at 6-6, entering the afternoon draw.
TV and streaming coverage resumed Friday morning. Seven members of the event’s broadcast team tested positive for COVID-19, forcing a five-day coverage halt and one session postponed.
After repeated negative testing by other members of the broadcast team, Alberta Health approved a proposal from the World Curling Federation to resume coverage with minimal staff for the final three days of competition.
Staff who have tested positive remain in isolation and are being monitored by medical authorities. Athletes and team officials stay in a different hotel from the broadcast staff.
Canada are looking to return to the podium for the first time since Jennifer Jones won the 2018 gold medal in North Bay, Ont.
Chelsea Carey represented Canada in 2019 in Silkeborg, Denmark, but did not make the playoffs. Last year’s championship was canceled due to the pandemic.
Brendan Bottcher represented Canada at the World Men’s Curling Championship last month in the curling bubble. He reached the six-team playoffs but lost the qualifying game.
This report by The Canadian Press was first published on May 7, 2021.