user: Question: When Julian Illingworth was the under-19, who was the under-15?
Columns: ['Year', 'Under-11', 'Under-13', 'Under-15', 'Under-17', 'Under-19']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1999.0, 'did not play', 'unknown', 'unknown', 'Moises Galvez', 'Bernardo Samper']
SQL:

assistant: SELECT "Under-15" FROM "Table" WHERE "Under-19" = 'Julian Illingworth';