CREATE TABLE table_name_75 (Id VARCHAR)

What is the 1993 value with a 1r in 1991 and sf in 1990?
SELECT 1993 FROM table_name_75 WHERE 1991 = "1r" AND 1990 = "sf"
SELECT 1993 FROM "table_name_75" WHERE "1r" = 1991 AND "sf" = 1990