CREATE TABLE table_23869 ("#" FLOAT, "Date" CLOB, "at/vs." CLOB, "Opponent" CLOB, "Score" CLOB, "Attendance" FLOAT, "Record" CLOB)

Who was the opponent on February 28, 1991
SELECT "Opponent" FROM table_23869 WHERE "Date" = 'February 28, 1991'
SELECT "Opponent" FROM "table_23869" WHERE "Date" = 'February 28, 1991'