Table: ftops_series
Columns: series
date
entrants
winner
first_prize

Question: When was the game that had a first prize of $161,480?
SQL: SELECT "date" FROM ftops_series WHERE "first_prize" = '$161,480'

Question: Who won on May 2011?
SQL: SELECT "winner" FROM ftops_series WHERE "date" = 'may 2011'