CREATE TABLE table_name_19 (opponent_number VARCHAR, attendance VARCHAR)
SELECT opponent_number FROM table_name_19 WHERE attendance = "42,000"
คู่ต่อสู้ในเกมที่มีผู้เข้าร่วม 42,000 คนคือใคร?
Who was the opponent in the game that was attended by 42,000 people?