CREATE TABLE table_41829 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner-up" TEXT)

What was the margin of victory on Mar 18, 1979?
SELECT "Margin of victory" FROM table_41829 WHERE "Date" = 'mar 18, 1979'
SELECT "Margin of victory" FROM "table_41829" WHERE "Date" = 'mar 18, 1979'