CREATE TABLE table_name_88 (margin VARCHAR, year VARCHAR, runner_s__up VARCHAR)

What margin was in after 1981, and was Roberto De Vicenzo runner-up?
SELECT margin FROM table_name_88 WHERE year > 1981 AND runner_s__up = "roberto de vicenzo"
SELECT "margin" FROM "table_name_88" WHERE "roberto de vicenzo" = "runner_s__up" AND "year" > 1981