List the maximum scores of the team Boston Red Stockings when the team won in postseason?
CREATE TABLE team (team_id_br VARCHAR, name VARCHAR); CREATE TABLE postseason (wins INTEGER, team_id_winner VARCHAR)
[SQL] SELECT MAX(T1.wins) FROM postseason AS T1 JOIN team AS T2 ON T1.team_id_winner = T2.team_id_br WHERE T2.name = 'Boston Red Stockings' [/SQL]