CREATE TABLE table_69047 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

What is Brown Motors best point total using the Offenhauser L4 engine since 1950?
SELECT MAX("Points") FROM table_69047 WHERE "Year" > '1950' AND "Engine" = 'offenhauser l4' AND "Entrant" = 'brown motors'
SELECT MAX("Points") FROM "table_69047" WHERE "Engine" = 'offenhauser l4' AND "Entrant" = 'brown motors' AND "Year" > '1950'