Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
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?
### Answer:
SELECT tournament FROM table_name_56 WHERE margin_of_victory = "2 strokes" AND date = "sep 20, 1981"