Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Championship | Winning score | Margin | Runner(s)-up |
| --- | --- | --- | --- | --- |
| 1981.0 | PGA Seniors' Championship | −7 (68-72-68-73=281) | 2 strokes | Arnold Palmer |
| 1982.0 | U.S. Senior Open | −2 (72-74-71-65=282) | 4 strokes | Gene Littler , Dan Sikes |
| 1983.0 | Senior Players Championship | −10 (71-69-70-68=278) | 1 stroke | Gene Littler |
| 1984.0 | U.S. Senior Open (2) | +6 (74-71-70-71=286) | 2 strokes | Arnold Palmer |
| 1985.0 | U.S. Senior Open (3) | −3 (71-72-71-71=285) | 4 strokes | Roberto De Vicenzo |
Question:
What margin was in after 1981, and was Roberto De Vicenzo runner-up?
Answer:
4 strokes