CREATE TABLE table_664 ("Year" FLOAT, "Dates" TEXT, "Champion" TEXT, "Country" TEXT, "Winning score" TEXT, "To par" TEXT, "Margin of victory" TEXT, "Purse  (  $  ) " FLOAT, "Winners share  ( $ ) " FLOAT)

How much is the purse ( $ ) when the margin of victory is 1 stroke?
SELECT "Purse ( $ )" FROM table_664 WHERE "Margin of victory" = '1 stroke'
SELECT "Purse ( $ )" FROM "table_664" WHERE "Margin of victory" = '1 stroke'