CREATE TABLE table_204_918 (id NUMBER, "week" NUMBER, "date" CLOB, "opponent" CLOB, "result" CLOB, "record" CLOB, "attendance" NUMBER, "bye" CLOB)

did they only play the denver broncos once ?
SELECT (SELECT COUNT(*) FROM table_204_918 WHERE "opponent" = 'denver broncos') = 1
WITH "_u_0" AS (SELECT COUNT(*), 'denver broncos' AS "_u_1" FROM "table_204_918" GROUP BY 'denver broncos') SELECT COALESCE("_u_0"."", *) = 1 LEFT JOIN "_u_0" "_u_0" ON "_u_0"."_u_1" = "opponent"