Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_56 ( tournament VARCHAR, margin_of_victory VARCHAR, date VARCHAR )

### Question ###
What is the name of the tournament played on Sep 20, 1981, ending with a margin of vicroty of 2 strokes?

### Accurate SQL ###

SELECT tournament FROM table_name_56 WHERE margin_of_victory = "2 strokes" AND date = "sep 20, 1981"