CREATE TABLE table_67244 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

What is the chassis of Officine Alfieri Maserati with a Maserati Straight-6 engine and fewer than 6 points?
SELECT "Chassis" FROM table_67244 WHERE "Engine" = 'maserati straight-6' AND "Entrant" = 'officine alfieri maserati' AND "Points" < '6'
SELECT "Chassis" FROM "table_67244" WHERE "Engine" = 'maserati straight-6' AND "Entrant" = 'officine alfieri maserati' AND "Points" < '6'