How many times did the Boston Red Stockings win in postseason?
select count(*) from postseason as t1 join team as t2 on t1.team_id_winner = t2.team_id_br where t2.name = 'Boston red Stockings';
What is the average score of the games that it won?
select avg(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';
How about the the maximum score?
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';