CREATE TABLE table_15691 ("Date" TEXT, "Score" TEXT, "Location" TEXT, "Competition" TEXT, "Serial No." TEXT)

On 11 Feb 1990, the competition is listed as what?
SELECT "Competition" FROM table_15691 WHERE "Date" = '11 feb 1990'
SELECT "Competition" FROM "table_15691" WHERE "Date" = '11 feb 1990'