CREATE TABLE table_204_883 (id DECIMAL, "pos." TEXT, "name" TEXT, "place of birth" TEXT, "date of birth" TEXT, "previous club" TEXT, "date joined" TEXT, "fee" TEXT)

how many players are listed as df ?
SELECT COUNT("name") FROM table_204_883 WHERE "pos." = 'df'
SELECT COUNT("name") FROM "table_204_883" WHERE "pos." = 'df'