user: ### NOW ANSWER:
Question: Who lost when the Mariners played on September 12?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Record']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['September 1', '@ Rangers', '9–3', 'Darwin (8–7)', '26–52']
SQL:

assistant: SELECT "Loss" FROM "Table" WHERE "Opponent" = 'Mariners' AND "Date" = 'September 12';