Table: pittsburgh_penguins_1967_68_3
Columns: date
visitor
score
home
attendance
record
points

Question: What was the attendance for the March 6 game, where one of the teams had 53 points.
SQL: SELECT "attendance" FROM pittsburgh_penguins_1967_68_3 WHERE "points" = 53 AND "date" = 'march 6'