Just looked it up in wikipedia. They use the Page Playoff system. Basically used for curling tournaments.
From Wikipedia -
Page playoff
The top four teams advance to the Page playoff. In what's sometimes called the quarter-finals, the first- and second-placed teams and the third- and fourth-placed teams play each other. The winner of the 1 vs. 2 game gets a bye to the final. The loser of the 1 vs. 2 game plays the winner of the 3 vs. 4 game in the semi-final. The winner of the semi-final plays the winner of the 1 vs. 2 game in the final, with the winner of that game winning the competition.
This has the effect of allowing the top two teams to lose a game and still win the tournament, producing a similar effect to a double-elimination tournament. This gives the top two teams a large advantage over the next two
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