Table: game_results_1973
Columns: date
opponent
rank
site
result
attendance

Question: Who was the opponent when the attendance was 87,453?
SQL: SELECT "opponent" FROM game_results_1973 WHERE "attendance" = '87,453'

Question: What was the attendance when they had a ranking of #4?
SQL: SELECT "attendance" FROM game_results_1973 WHERE "rank" = '4'