CREATE TABLE table_18733480_1 (team_1 VARCHAR, team_2 VARCHAR)
SELECT team_1 FROM table_18733480_1 WHERE team_2 = "Chalkheads"
ใครคือทีม 1 เมื่อหัวดำคือทีม 2?
Who was team 1 when the chalkheads were team 2?