Ulsan Mayor's Cup Seniors

The professional half of the Ulsan Metropolitan Mayor's Cup (울산광역시장배 전국바둑대회), a civic festival that fills an Ulsan sports hall with several hundred amateurs each autumn and reserves one bracket for the veterans: men aged 45 and over, women 40 and over. That entry rule makes it one of the few places where Cho Hunhyun, Seo Bongsoo, Yu Changhyuk and Lee Changho — the four kings who divided Korean Go between them for two decades — still meet across a board with a title at stake. First prize is 25 million won, with 10 million to the runner-up.