CREATE TABLE table_20273 ("No." FLOAT, "Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "To par" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

Name the tournament when margin of victory is 3 strokes and winning score is 71-66-70-67=274
SELECT "Tournament" FROM table_20273 WHERE "Margin of victory" = '3 strokes' AND "Winning score" = '71-66-70-67=274'
SELECT "Tournament" FROM "table_20273" WHERE "Margin of victory" = '3 strokes' AND "Winning score" = '71-66-70-67=274'