Score of 2-1, and a Competition of pl, and a Date of december 22, 2006 had what opponents?
CREATE TABLE "results" (
  "date" text,
  "venue" text,
  "opponents" text,
  "score" text,
  "competition" text
);
SELECT "opponents" FROM "results" WHERE "score"='2-1' AND "competition"='pl' AND "date"='december 22, 2006';