What is the number of points that driver fernando alonso has in the season he had 20 races?
CREATE TABLE "most_championship_points_in_a_season" (
  "driver" text,
  "points" real,
  "season" text,
  "races" real,
  "percentage_of_possible_points" text
);
SELECT SUM("points") FROM "most_championship_points_in_a_season" WHERE "races"=20 AND "driver"='fernando alonso';