CREATE TABLE table_name_96 (semi_final_dual_television_commentator VARCHAR2, grand_final_television_commentator VARCHAR2, spokesperson VARCHAR2)

What is the semi-final dual television commentator status of the year with Pierre Tchernia as the grand final television commentator and an unknown spokesperson?
SELECT semi_final_dual_television_commentator FROM table_name_96 WHERE grand_final_television_commentator = "pierre tchernia" AND spokesperson = "unknown"
SELECT "semi_final_dual_television_commentator" FROM "table_name_96" WHERE "grand_final_television_commentator" = "pierre tchernia" AND "spokesperson" = "unknown"