CREATE TABLE table_66914 ("Stage" TEXT, "Winner" TEXT, "General classification" TEXT, "Points classification" TEXT, "Mountains classification" TEXT, "Intergiro classification" TEXT, "Trofeo Fast Team" TEXT)

Which points classification was used in stage 15?
SELECT "Points classification" FROM table_66914 WHERE "Stage" = '15'
SELECT "Points classification" FROM "table_66914" WHERE "Stage" = '15'