user: Question: What is the 1st leg score when US Mbila Nzambi is team 1?
Columns: ['Team 1', 'Agg.', 'Team 2', '1st leg', '2nd leg']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Costa do Sol', '2-6', 'Nchanga Rangers', '1-3', '1-3']
SQL:

assistant: SELECT "1st leg" FROM "Table" WHERE "Team 1" = 'US Mbila Nzambi';