CREATE TABLE table_14647 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

What was Yardley-BRM's points high after 1971?
SELECT MAX("Points") FROM table_14647 WHERE "Entrant" = 'yardley-brm' AND "Year" > '1971'
SELECT MAX("Points") FROM "table_14647" WHERE "Entrant" = 'yardley-brm' AND "Year" > '1971'