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:
| Race name | Dist (miles) | Course | Prize | Odds | Runners | Place | Runner-up |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Match race v. Speedwell | 4 | Newmarket | 500 guineas | not known | 2.0 | 1.0 | Speedwell |
| Match race v. Speedwell | not known | Newmarket | 500 guineas | not known | 2.0 | 1.0 | forfeit |
| Trial v. Almanzor and Brown Betty | 4 | Newmarket | none | not known | 3.0 | 1.0 | not known |
| Match race v. Chaunter | 6 | Newmarket | 1000 guineas | not known | 2.0 | 1.0 | Chaunter |
| Race v. Stripling and Bridgewater's Lonsdale Mare | not known | Newmarket | 100 guineas | not known | 3.0 | 1.0 | forfeit |
| Match race v. Bobsey | not known | Newmarket | 100 guineas | not known | 2.0 | 1.0 | forfeit |
Question:
Which race had a distance of 4 miles where the runner-up was not known?
Answer:
Trial v. Almanzor and Brown Betty