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_55 ( date VARCHAR, margin_of_victory VARCHAR, runner_s__up VARCHAR )

### Question ###
Which date was the event that Yani won in a playoff over Yueh-Chyn Huang?

### Accurate SQL ###

SELECT date FROM table_name_55 WHERE margin_of_victory = "playoff" AND runner_s__up = "yueh-chyn huang"