Table: pga_seniors_championship_results
Columns: year
championship
winning_score
margin
runner_s_up

Question: What margin was in after 1981, and was Roberto De Vicenzo runner-up?
SQL: SELECT "margin" FROM pga_seniors_championship_results WHERE "year" > 1981 AND "runner_s_up" = 'roberto de vicenzo'

Question: What championship was in 1985?
SQL: SELECT "championship" FROM pga_seniors_championship_results WHERE "year" = 1985