CREATE TABLE table_4913 ("Date" CLOB, "Round" CLOB, "Circuit" CLOB, "Winning driver" CLOB, "Winning team" CLOB, "Winning car" CLOB)

For the race held on 10/08/86, what was the circuit?
SELECT "Circuit" FROM table_4913 WHERE "Date" = '10/08/86'
SELECT "Circuit" FROM "table_4913" WHERE "Date" = '10/08/86'