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

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