CREATE TABLE table_10950 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

When the away team score was 11.5 (71), what was the date?
SELECT "Date" FROM table_10950 WHERE "Away team score" = '11.5 (71)'
SELECT "Date" FROM "table_10950" WHERE "Away team score" = '11.5 (71)'