CREATE TABLE table_66217 ("Round" TEXT, "Date" TEXT, "Opponent" TEXT, "Venue" TEXT, "Result" TEXT, "Attendance" FLOAT)

What round has 2-1 as the result, and A as the venue?
SELECT "Round" FROM table_66217 WHERE "Result" = '2-1' AND "Venue" = 'a'
SELECT "Round" FROM "table_66217" WHERE "Result" = '2-1' AND "Venue" = 'a'