Table: northern_league_stats_2
Columns: position
team
played
drawn
lost
goals_for
goals_against
goal_average_1
points_2

Question: What is the sum of Altrincham's Points 2 when they had more than 52 Goals For?
SQL: SELECT SUM("points_2") FROM northern_league_stats_2 WHERE "goals_for" > 52 AND "team" = 'altrincham'