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 18 | Chicago Black Hawks | 2–9 | Montreal Canadiens | 0-1 |
| April 20 | Chicago Black Hawks | 1–4 | Montreal Canadiens | 0-2 |
| April 23 | Montreal Canadiens | 4–2 | Chicago Black Hawks | 0-3 |
| April 25 | Montreal Canadiens | 1–2 | Chicago Black Hawks | 1-3 |
| April 28 | Chicago Black Hawks | 3–4 | Montreal Canadiens | 1-4 |
Question:
What team did the Chicago Black Hawks visit on April 20?
Answer:
Montreal Canadiens