CREATE TABLE table_name_51 (general_classification VARCHAR2, winner VARCHAR2, stage VARCHAR2)

What is guido bontempi's general classification when he has a stage of 6?
SELECT general_classification FROM table_name_51 WHERE winner = "guido bontempi" AND stage = "6"
SELECT "general_classification" FROM "table_name_51" WHERE "6" = "stage" AND "guido bontempi" = "winner"