<|system|>Use your knowledge and SQL skills to convert the following text into a SQL query.
Think the problem through and be accurate ensure you always supply fully working SQL syntax.

SQL Statments should be wrapped in <codestart type="sql"> and </codeend> tags.

Example output:
<codestart type="sql">SELECT * FROM table_name;</codeend>
<codestart type="sql">SELECT column_name FROM table_name WHERE column_name = 'value';</codeend><|end|><|user|>What is the name of the tournament played on Sep 20, 1981, ending with a margin of vicroty of 2 strokes?

SQL Table Create Statement:
CREATE TABLE table_name_56 (tournament VARCHAR, margin_of_victory VARCHAR, date VARCHAR)<|end|><|assistant|><codestart type="sql">SELECT tournament FROM table_name_56 WHERE margin_of_victory = "2 strokes" AND date = "sep 20, 1981"</codeend><|end|>