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:
| Date | Round | Opponent | Venue | Result | Attendance | Scorers |
| --- | --- | --- | --- | --- | --- | --- |
| 3 January 1970 | R3 | Birmingham City | H | 3-0 | 45088.0 | Osgood , Hutchinson (2) |
| 24 January 1970 | R4 | Burnley | H | 2-2 | 42282.0 | Hollins , Osgood |
| 27 January 1970 | R4 (R) | Burnley | A | 3-1 ( a.e.t. ) | 32000.0 | Baldwin , Houseman (2) |
| 7 February 1970 | R5 | Crystal Palace | A | 4-1 | 48479.0 | Osgood , Dempsey , Houseman , Hutchinson |
| 21 February 1970 | QF | Queens Park Rangers | A | 4-2 | 33572.0 | Osgood (3), Webb |
| 14 March 1970 | SF | Watford | N | 5-1 | 55209.0 | Webb , Osgood , Houseman (2), Hutchinson |
| 11 April 1970 | F | Leeds United | N | 2-2 ( a.e.t. ) | 100000.0 | Houseman , Hutchinson |
| 29 April 1970 | F (R) | Leeds United | N | 2-1 ( a.e.t. ) | 62078.0 | Osgood , Webb |
Question:
What round was the game with a result of 5-1 at N venue?
Answer:
SF