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_17282875_3 ( team__number2 VARCHAR )

### Question ###
When they played Universidad de Chile, what was the score of the first leg?

### Accurate SQL ###

SELECT COUNT(1 AS st_leg) FROM table_17282875_3 WHERE team__number2 = "Universidad de Chile"