CREATE TABLE table_204_513 (id DECIMAL, "date" TEXT, "time" TEXT, "opponent#" TEXT, "site" TEXT, "tv" TEXT, "result" TEXT, "attendance" DECIMAL)

which game has the least attendance ?
SELECT "opponent#" FROM table_204_513 ORDER BY "attendance" LIMIT 1
SELECT "opponent#" FROM "table_204_513" ORDER BY "attendance" NULLS FIRST LIMIT 1