Which date was the event that Yani won in a playoff over Yueh-Chyn Huang?
CREATE TABLE "other_wins_11" (
  "date" text,
  "winning_score" text,
  "to_par" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "date" FROM "other_wins_11" WHERE "margin_of_victory"='playoff' AND "runner_s_up"='yueh-chyn huang';