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

How many times did Boston Red Stockings lose in 2009 postseason?
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
SELECT COUNT(*) FROM "postseason" AS "T1" JOIN "team" AS "T2" ON "T1"."team_id_loser" = "T2"."team_id_br" AND "T2"."name" = 'Boston Red Stockings' WHERE "T1"."year" = 2009