Table schema:
CREATE TABLE table_name_83 (heat_points INTEGER, date VARCHAR, result VARCHAR, game VARCHAR)

Question: What is the average Heat Points, when Result is "Loss", when Game is greater than 72, and when Date is "April 21"?
SQL: SELECT AVG(heat_points) FROM table_name_83 WHERE result = "loss" AND game > 72 AND date = "april 21"