How many games had a score value of 813.5 in post-season play?
CREATE TABLE "table1_1059743_1" (
  "rank" real,
  "member_association" text,
  "points" text,
  "group_stage" real,
  "play_off" real,
  "afc_cup" real
);
SELECT COUNT("play_off") FROM "table1_1059743_1" WHERE "points"='813.5';