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 postseason (team_id_loser VARCHAR, year VARCHAR)
TABLE: CREATE TABLE team (team_id_br VARCHAR, name VARCHAR)

### Question ###
How many times did Boston Red Stockings lose in 2009 postseason?

### Accurate SQL ###

SELECT COUNT(*) FROM postseason AS T1 JOIN team AS T2 ON T1.team_id_loser = T2.team_id_br WHERE T2.name = 'Boston Red Stockings' AND T1.year = 2009