CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);

Question: What is the average points that Centro Asegurador earned with the McLaren M23 chassis?
SQL: SELECT AVG("points") FROM "complete_formula_one_world_championship_" WHERE "chassis"='mclaren m23' AND "entrant"='centro asegurador';

Question: What was the chassis of Emilio de Villota in 1981?
SQL: SELECT "chassis" FROM "complete_formula_one_world_championship_" WHERE "year">1981;