user: Question: What round is SF/SG player Sly Williams from a year after 1965 from?
Columns: ['Year', 'Round', 'Player', 'Nationality', 'Position', 'College/High School/Club']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1947.0, '1', 'Dick Holub', 'United States', 'C', 'Long Island']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Position" = 'SF/SG' AND "Year" > 1965.0 AND "Player" = 'Sly Williams';