CREATE TABLE table_56624 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

How many rounds did the event rings: king of kings 2000 block a have with a record of 6-1?
SELECT "Round" FROM table_56624 WHERE "Event" = 'rings: king of kings 2000 block a' AND "Record" = '6-1'
SELECT "Round" FROM "table_56624" WHERE "Event" = 'rings: king of kings 2000 block a' AND "Record" = '6-1'