Group 1 of the 71st Inter High School Mahjong Championships includes the first seeded Shiraitodai High School and 12 schools that drew the 2–13 spots in the tournament.
First tournament round -- day 1
Winners of each first round match meet Shiraitodai, which has a bye in the first round.
Second tournament round -- day 5
Two winners of the second round match of Group 1 meet the two winners of Group 2
in one of two semi-final
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