teams needed to win back-to-back games. The League of Legends Pro League also uses the same system to determine its final two World Championship berths since 2020, followed by League of Legends Champions Korea since 2022. Format The system requires teams to be ranked in some way, as the top two teams have an advantage over the bottom two. This is usually accomplished through a round-robin tournament, which eliminates all but the top four teams. Round-robin A standard round-robin tournament is used, in which all teams play each other once. Because the number of total games increases quadratically with respect to the number of teams, scheduling too many teams will result in an unwieldy number of games, particularly when there are a limited number of playing surfaces (championship curling arenas usually only have four or five sheets). Therefore, the number of teams is usually capped at around a dozen; if this is not possible or desirable, teams may be separated into groups playing separate round-robins and either having the top teams combining for the Page playoff or playing separate ones in each group and having the winners play each other after. Page playoff system The system was invented in Australia in the early 1930s and adopted soon after by the Victorian Football League (now known as the Australian Football League). The top four teams advance to the playoffs, which are played over three rounds with one team being eliminated in each round. The format progresses as follows: In Game 1, the third- and fourth-placed teams play against each other. The loser is eliminated. In Game 2, the first- and second-placed teams play against each other. The winner qualifies directly for the final. In Game 3, the winner of Game 1 plays against the loser of Game 2. The loser is eliminated. Game 4 (the final) is then played between the winners of Games 2 and 3. This system gives the top two teams a double chance, in that they can lose their first game and still go on to win the title, producing a similar though not identical effect to a double-elimination tournament. This gives the top two teams a significant advantage over the next two, since winning the title from third or fourth place requires winning one more game than winning from first or second, and also requires defeating every other team in the playoffs. Additionally, the higher-ranked team