CREATE TABLE table_46137 ("Date" CLOB, "Winning score" CLOB, "To par" CLOB, "Margin of victory" CLOB, "Runner ( s ) -up" CLOB)

Which date was the event that Yani won in a playoff over Yueh-Chyn Huang?
SELECT "Date" FROM table_46137 WHERE "Margin of victory" = 'playoff' AND "Runner(s)-up" = 'yueh-chyn huang'
SELECT "Date" FROM "table_46137" WHERE "Margin of victory" = 'playoff' AND "Runner(s)-up" = 'yueh-chyn huang'