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 | Visitor | Score | Home | Record |
| --- | --- | --- | --- | --- |
| April 13 | Chicago Black Hawks | 1–4 | Buffalo Sabres | 0-1 |
| April 15 | Chicago Black Hawks | 1–3 | Buffalo Sabres | 0-2 |
| April 17 | Buffalo Sabres | 4–5 | Chicago Black Hawks | 1-2 |
| April 20 | Buffalo Sabres | 6–2 | Chicago Black Hawks | 1-3 |
| April 22 | Chicago Black Hawks | 1–3 | Buffalo Sabres | 1-4 |
Question:
Name the Visitor that has a Home of chicago black hawks on april 20?
Answer:
Buffalo Sabres