user: Question: What was the score of the 2nd leg when the Belgrano played the first leg at home with a score of 2-1?
Columns: ['Home (1st leg)', 'Home (2nd leg)', '1st Leg', '2nd leg', 'Aggregate']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Guaraní', 'Platense', '0-0', '0-1', '0-1']
SQL:

assistant: SELECT "2nd leg" FROM "Table" WHERE "1st Leg" = '2-1' AND "Home (1st leg)" = 'Belgrano';