user: Question: What tournament since 1973 has a result of 1st?
Columns: ['Year', 'Tournament', 'Venue', 'Result', 'Extra']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1973.0, 'European Junior Championships', 'Duisburg , West Germany', '1st', '4x400 m relay']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Result" = '1st' AND "Year" > 1973.0;