Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
When was the event that had Liberia as an opponent and resulted in a 1-0 score?

### Inputs:
table_name: table, columns: ['Date', 'Location', 'Opponent', 'Score', 'Competition']

### Response:
SELECT Date FROM table WHERE Opponent = liberia AND Score = 1-0