CREATE TABLE table_31715 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Attendance" FLOAT)

Tell me opponent for result of w 33-31
SELECT "Opponent" FROM table_31715 WHERE "Result" = 'w 33-31'
SELECT "Opponent" FROM "table_31715" WHERE "Result" = 'w 33-31'