How many points are there for a Mclaren m23 chassis later than 1972?
CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);
SELECT COUNT("points") FROM "complete_formula_one_world_championship_" WHERE "year">1972 AND "chassis"='mclaren m23';