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 | Opponent# | Rank# | Site | Result |
| --- | --- | --- | --- | --- |
| 09/28/1946 | at Illinois |  | Memorial Stadium • Champaign, IL | W 26-6 |
| 10/05/1946 | Pittsburgh |  | Notre Dame Stadium • Notre Dame, IN | W 33-0 |
| 10/12/1946 | Purdue | #3 | Notre Dame Stadium • Notre Dame, IN | W 49-6 |
| 10/26/1946 | at #17 Iowa | #2 | Iowa Stadium • Iowa City, IA | W 41-6 |
| 11/02/1946 | vs. Navy | #2 | Memorial Stadium • Baltimore, MD | W 28-0 |
| 11/08/1946 | vs. #1 Army | #2 | Yankee Stadium • New York, NY | T 0-0 |
| 11/16/1946 | at Northwestern | #2 | Notre Dame Stadium • Notre Dame, IN | W 27-0 |
| 11/23/1946 | at Tulane | #2 | Tulane Stadium • New Orleans, LA | W 41-0 |
| 11/30/1946 | #16 Southern California | #2 | Notre Dame Stadium • Notre Dame, IN | W 26-6 |
Question:
how many games were only won by 20 points or less?
Answer:
2