When was the event that had Liberia as an opponent and resulted in a 1-0 score?
CREATE TABLE "recent_results_and_forthcoming_fixtures" (
  "date" text,
  "location" text,
  "opponent" text,
  "score" text,
  "competition" text
);
SELECT "date" FROM "recent_results_and_forthcoming_fixtures" WHERE "opponent"='liberia' AND "score"='1-0';