CREATE TABLE table_77997 ("Round" CLOB, "Date" CLOB, "Opponent" CLOB, "Venue" CLOB, "Result" CLOB)

What is the Round with a Opponent with blackburn?
SELECT "Round" FROM table_77997 WHERE "Opponent" = 'blackburn'
SELECT "Round" FROM "table_77997" WHERE "Opponent" = 'blackburn'