SELECT year FROM table_name_12 WHERE winner = "olympiacos" AND venue = "georgios karaiskakis stadium" AND runner_up = "iraklis"
Kapan pemenang Olympiacos, venue tersebut adalah Stadion Georgios Karaiskakis dan runner-up adalah Iraklis?
CREATE TABLE table_name_12 (year VARCHAR, runner_up VARCHAR, winner VARCHAR, venue VARCHAR)