CREATE TABLE table_name_56 (caps INT, position VARCHAR, date_of_birth__age_ VARCHAR)

What is the lowest number of caps of the fullback player born on 13 April 1983?
SELECT MIN(caps) FROM table_name_56 WHERE position = "fullback" AND date_of_birth__age_ = "13 april 1983"
SELECT MIN("caps") FROM "table_name_56" WHERE "13 april 1983" = "date_of_birth__age_" AND "fullback" = "position"