What are the maximum scores the team Boston Red Stockings got when the team won in postseason?
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';
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';
[{'max(T1.wins)': 5}]