CREATE TABLE table_78666 ("Week" TEXT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Location" TEXT)

What was the result of the game at the Riverfront Stadium after week 8?
SELECT "Result" FROM table_78666 WHERE "Location" = 'riverfront stadium' AND "Week" = '8'
SELECT "Result" FROM "table_78666" WHERE "Location" = 'riverfront stadium' AND "Week" = '8'