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_73684 ( "Season" real, "MLS Regular Season" text, "MLS Cup Playoffs" text, "Lamar Hunt U.S. Open Cup" text, "CONCACAF Champions Cup / CONCACAF Champions League" text )

### Question ###
What was the mls cup playoffs when concacaf champions cup / concacaf champions league was quarter-finals (09-10)?

### Accurate SQL ###

SELECT "MLS Cup Playoffs" FROM table_73684 WHERE "CONCACAF Champions Cup / CONCACAF Champions League" = 'Quarter-Finals (09-10)'