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:
| Week | Date | Opponent | Result | Score | Record |
| --- | --- | --- | --- | --- | --- |
| 1.0 | August 31, 1947 | Brooklyn Dodgers | W | 23-7 | 1-0 |
| 2.0 | September 7, 1947 | Los Angeles Dons | W | 17-14 | 2-0 |
| 3.0 | September 14, 1947 | Baltimore Colts | W | 14-7 | 3-0 |
| 4.0 | September 21, 1947 | New York Yankees | L | 21-16 | 3-1 |
| 5.0 | September 28, 1947 | at Buffalo Bills | W | 41-24 | 4-1 |
| 6.0 | October 5, 1947 | at Baltimore Colts | T | 28-28 | 4-1-1 |
| 7.0 | October 12, 1947 | Chicago Rockets | W | 42-28 | 5-1-1 |
| 8.0 | October 26, 1947 | Cleveland Browns | L | 14-7 | 5-2-1 |
| 9.0 | November 2, 1947 | at Los Angeles Dons | W | 26-16 | 6-2-1 |
| 10.0 | November 9, 1947 | at New York Yankees | L | 24-16 | 6-3-1 |
| 11.0 | November 16, 1947 | at Cleveland Browns | L | 37-14 | 6-4-1 |
| 12.0 | November 21, 1947 | at Chicago Rockets | W | 41-16 | 7-4-1 |
| 13.0 | November 27, 1947 | at Brooklyn Dodgers | W | 21-7 | 8-4-1 |
| 14.0 | December 7, 1947 | Buffalo Bills | T | 21-21 | 8-4-2 |
Question:
Who was the opponent at the game with a score of 42-28 after week 4?
Answer:
Chicago Rockets