CREATE TABLE table_203_672 (id NUMBER, "week" NUMBER, "date" CLOB, "opponent" CLOB, "result" CLOB, "venue" CLOB, "attendance" NUMBER)

who was the only opponent to allow no points in a game ?
SELECT "opponent" FROM table_203_672 WHERE "result" = 0
SELECT "opponent" FROM "table_203_672" WHERE "result" = 0