CREATE TABLE table_204_918 (id DECIMAL, "week" DECIMAL, "date" TEXT, "opponent" TEXT, "result" TEXT, "record" TEXT, "attendance" DECIMAL, "bye" TEXT)

how many points did the ravens win by in week 13 ?
SELECT "result" - "result" FROM table_204_918 WHERE "week" = 13
SELECT "result" - "result" FROM "table_204_918" WHERE "week" = 13