CREATE TABLE table_50135 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

What method was used in the match that went to round 1, and had a 6-3-1 record?
SELECT "Method" FROM table_50135 WHERE "Round" = '1' AND "Record" = '6-3-1'
SELECT "Method" FROM "table_50135" WHERE "Record" = '6-3-1' AND "Round" = '1'