CREATE TABLE table_name_57 (position VARCHAR, years VARCHAR)
SELECT position FROM table_name_57 WHERE years = "1986 – 1991 1997 – 1999"
นักเตะเล่นตำแหน่งใดระหว่างปี 1986 – 1991 1997 – 1999?
What position was played by the player during 1986 – 1991 1997 – 1999?