Who was the game played against on 2004-02-28 at Skytteholms IP?
CREATE TABLE "friendly_2004" (
  "date" text,
  "venue" text,
  "opponents" text,
  "score" text,
  "comp" text
);
SELECT "opponents" FROM "friendly_2004" WHERE "venue"='skytteholms ip' AND "date"='2004-02-28';