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_20 (winning_score VARCHAR, date VARCHAR)

### Question ###
What is the winning score of the tournament on 16 May 1993?

### Accurate SQL ###

SELECT winning_score FROM table_name_20 WHERE date = "16 may 1993"