CREATE TABLE table_23721 ("Player" TEXT, "Played" FLOAT, "Legs Won" FLOAT, "Legs Lost" FLOAT, "100+" FLOAT, "140+" FLOAT, "180s" FLOAT, "High Checkout" FLOAT, "3-dart Average" TEXT)

How many players had 6 180s?
SELECT COUNT("Player") FROM table_23721 WHERE "180s" = '6'
SELECT COUNT("Player") FROM "table_23721" WHERE "180s" = '6'