Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Tie no | Home team | Score | Away team | Date |
| --- | --- | --- | --- | --- |
| 1 | Liverpool | 3–1 | Oldham Athletic | 26 February 1977 |
| 2 | Southampton | 2–2 | Manchester United | 26 February 1977 |
| Replay | Manchester United | 2–1 | Southampton | 8 March 1977 |
| 3 | Aston Villa | 3–0 | Port Vale | 26 February 1977 |
| 4 | Wolverhampton Wanderers | 1–0 | Chester | 26 February 1977 |
| 5 | Middlesbrough | 4–1 | Arsenal | 26 February 1977 |
| 6 | Derby County | 3–1 | Blackburn Rovers | 26 February 1977 |
| 7 | Cardiff City | 1–2 | Everton | 26 February 1977 |
| 8 | Leeds United | 1–0 | Manchester City | 26 February 1977 |
Question:
What's the score when the tie number was 6?
Answer:
3–1