user: Question: When was the event that had Liberia as an opponent and resulted in a 1-0 score?
Columns: ['Date', 'Location', 'Opponent', 'Score', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['24 March 2013', 'Monrovia', 'Liberia', '2-0', '2014 World Cup qualification']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Liberia' AND "Score" = '1-0';