CREATE TABLE table_49847 ("Res." CLOB, "Record" CLOB, "Opponent" CLOB, "Method" CLOB, "Round" CLOB, "Location" CLOB)

What round did the fight last when Mikhail Ilyukhin's record was 15-5?
SELECT "Round" FROM table_49847 WHERE "Record" = '15-5'
SELECT "Round" FROM "table_49847" WHERE "Record" = '15-5'